Geomorphology is the study of landforms and seeks to explain landscape shapes through structures, materials, and processes. It relates to other geological disciplines as tectonics and climate determine geomorphology, while landforms provide evidence of geological history. Geomorphology considers how landforms reveal information like the sense of tectonic motions from fault scarps or past climate from glacial moraines. Quantitative geomorphology models landscape evolution processes like hillslope failure thresholds and drainage network development using concepts from diffusion, hydrology, and soil mechanics. Landforms also provide clues about magnitudes and rates of tectonic deformation when their original shapes and ages are known.
The document discusses 10 key concepts in geomorphology. It begins by defining geomorphology as the study of landforms and their formation and development. It then explains each concept in 1-2 paragraphs with examples. The concepts are: 1) Uniformitarianism, 2) Role of geologic structure, 3) Differential erosion rates, 4) Distinct landforms from geomorphic processes, 5) Geomorphic cycles, 6) Complex geomorphic evolution, 7) Young topography, 8) Impact of Pleistocene climate change, 9) Role of climate on processes, 10) Historical approach. The document concludes with a quick review of the 10 concepts.
A map is a representation of Earth's surface that shows spatial relationships between objects by depicting their distance, direction, and size relative to each other on a flat surface. Maps convey information about a specific area and indicate its position relative to other parts of Earth. A geological map specifically shows the distribution and types of rocks and soils in an area. Geological maps are important tools used by geologists to understand Earth's structure and history, locate resources, and identify natural hazards.
The document summarizes the tectonic framework of India in 3 broad divisions - Peninsular India, Extra-Peninsular India, and the Indo-Gangetic Plain. Peninsular India comprises the Indian shield and its sedimentary basins, and is further divided into the shield areas, mobile belts, and Proterozoic sedimentary basins. Extra-Peninsular India includes the Himalayan mountain ranges, divided into the Lesser Himalayan zone, Central Crystalline zone, and Tethyan zone. The Indo-Gangetic Plain is a deep crustal trough in northern India filled with Quaternary sediments.
Models of landscape evolution and slope development by kingCharu Jaiswal
King proposed a model of landscape evolution and slope development consisting of three components: slope elements, hill slope development, and an epigene cycle of erosion. The slope elements include a waxing slope, free face, debris slope, and waning slope. Hill slopes develop through the parallel retreat of these slope elements, resulting in the expansion and merging of pediments. The epigene cycle involves periodic stream incision and escarpment retreat driven by erosion processes, forming new landscapes and cyclic surfaces over geological timescales. King's model emphasizes the role of erosion and semi-arid climates and rejects climatic influences on landscape development.
Concept 1. The same physical processes and laws that operate today operated throughout geologic time, although not necessarily always with the same intensity as now.
Concept 2. Geologic structure is a dominant control factor in the evolution of land forms and is reflected in them.
This document provides an overview of glaciers, including their formation, movement, and important terminology. It describes the key parts of a glacier, including the accumulation and ablation zones. The document also discusses different types of glaciers and their varying speeds of movement. Finally, it covers the erosional and depositional landforms created by glaciers, such as moraines, eskers, and drumlins.
The document describes various fluvial landforms found in the upper course of a river. Vertical erosion dominates and produces V-shaped valleys with interlocking spurs. Rapids and waterfalls form where the gradient suddenly increases, such as at bands of harder rock. Potholes are eroded by spinning pebbles in eddies and widen/deepen through abrasion. Braided channels occur where rivers carry large sand/gravel loads that deposit as shifting bars and islands, dividing the channel.
This document discusses various aeolian (wind-related) landforms. It begins by defining aeolian processes and explaining how wind erosion can cause deflation, abrasion, and attrition. Deflation removes loose particles while abrasion wears down rocks. Attrition rounds particles as they collide. Wind then transports material through suspension, saltation, and traction. This leads to the formation of deserts like hamadas (rocky deserts), ergs (sand seas), and regs (stony deserts). Erosional landforms include yardangs, zeugen, inselbergs, and playa lakes. Depositional forms include various types of sand dunes (barchans, transverse, par
The document discusses 10 key concepts in geomorphology. It begins by defining geomorphology as the study of landforms and their formation and development. It then explains each concept in 1-2 paragraphs with examples. The concepts are: 1) Uniformitarianism, 2) Role of geologic structure, 3) Differential erosion rates, 4) Distinct landforms from geomorphic processes, 5) Geomorphic cycles, 6) Complex geomorphic evolution, 7) Young topography, 8) Impact of Pleistocene climate change, 9) Role of climate on processes, 10) Historical approach. The document concludes with a quick review of the 10 concepts.
A map is a representation of Earth's surface that shows spatial relationships between objects by depicting their distance, direction, and size relative to each other on a flat surface. Maps convey information about a specific area and indicate its position relative to other parts of Earth. A geological map specifically shows the distribution and types of rocks and soils in an area. Geological maps are important tools used by geologists to understand Earth's structure and history, locate resources, and identify natural hazards.
The document summarizes the tectonic framework of India in 3 broad divisions - Peninsular India, Extra-Peninsular India, and the Indo-Gangetic Plain. Peninsular India comprises the Indian shield and its sedimentary basins, and is further divided into the shield areas, mobile belts, and Proterozoic sedimentary basins. Extra-Peninsular India includes the Himalayan mountain ranges, divided into the Lesser Himalayan zone, Central Crystalline zone, and Tethyan zone. The Indo-Gangetic Plain is a deep crustal trough in northern India filled with Quaternary sediments.
Models of landscape evolution and slope development by kingCharu Jaiswal
King proposed a model of landscape evolution and slope development consisting of three components: slope elements, hill slope development, and an epigene cycle of erosion. The slope elements include a waxing slope, free face, debris slope, and waning slope. Hill slopes develop through the parallel retreat of these slope elements, resulting in the expansion and merging of pediments. The epigene cycle involves periodic stream incision and escarpment retreat driven by erosion processes, forming new landscapes and cyclic surfaces over geological timescales. King's model emphasizes the role of erosion and semi-arid climates and rejects climatic influences on landscape development.
Concept 1. The same physical processes and laws that operate today operated throughout geologic time, although not necessarily always with the same intensity as now.
Concept 2. Geologic structure is a dominant control factor in the evolution of land forms and is reflected in them.
This document provides an overview of glaciers, including their formation, movement, and important terminology. It describes the key parts of a glacier, including the accumulation and ablation zones. The document also discusses different types of glaciers and their varying speeds of movement. Finally, it covers the erosional and depositional landforms created by glaciers, such as moraines, eskers, and drumlins.
The document describes various fluvial landforms found in the upper course of a river. Vertical erosion dominates and produces V-shaped valleys with interlocking spurs. Rapids and waterfalls form where the gradient suddenly increases, such as at bands of harder rock. Potholes are eroded by spinning pebbles in eddies and widen/deepen through abrasion. Braided channels occur where rivers carry large sand/gravel loads that deposit as shifting bars and islands, dividing the channel.
This document discusses various aeolian (wind-related) landforms. It begins by defining aeolian processes and explaining how wind erosion can cause deflation, abrasion, and attrition. Deflation removes loose particles while abrasion wears down rocks. Attrition rounds particles as they collide. Wind then transports material through suspension, saltation, and traction. This leads to the formation of deserts like hamadas (rocky deserts), ergs (sand seas), and regs (stony deserts). Erosional landforms include yardangs, zeugen, inselbergs, and playa lakes. Depositional forms include various types of sand dunes (barchans, transverse, par
The document presents a presentation on karst topography given by Ahmad Raza. It defines karst topography as areas with limestone or dolomite bedrock that have distinctive landforms formed by the dissolution of bedrock by water. It discusses the worldwide distribution of karst areas and the conditions required for karst formation. Key erosional landforms of karst include sinkholes, dolines, swallow holes, and caves. Depositional landforms include stalactites, stalagmites, and columns. Karst landscapes progress through youth, mature, and old stages as surface streams disappear underground over time. Karst is important for engineering projects, water resource studies, and paleoclimate research.
Davis and Penk proposed different models of the cycle of erosion. Davis' model involved three stages - youth, maturity, and old age - where a landscape evolves from high relief to a flat plain over time. Penk emphasized the relationship between uplift and erosion, with landforms resulting from their competition. Later theorists like King and Gilbert built on these ideas but acknowledged no single model explains all landscapes given different environments. While influential, both Davis and Penk's concepts have limitations and underwent criticism regarding assumptions about rates of uplift and erosion.
Mass wasting refers to the downslope movement of soil, rock debris, and bedrock under the force of gravity. It is a form of erosion and transportation that can occur slowly over geologic time or suddenly during catastrophic events. The main types of mass wasting are slides, flows, falls, and creep. Factors that influence mass wasting include slope angle, rock/soil type, water content, climate, earthquakes/volcanic activity, and pre-existing weaknesses in bedrock. Common landslide types are slumps, debris flows, rock slides, and debris slides/slumps. Creep is a very slow form of downslope movement caused by processes like wetting/drying, freezing/thawing, and
1. The document discusses concepts in geophysics including isostasy, density, susceptibility, and resistivity of rocks. Isostasy refers to equilibrium between the earth's lithosphere and asthenosphere. Density is a measure of how tightly packed molecules are in a material. Susceptibility measures a material's magnetization in response to an external magnetic field. Resistivity quantifies a material's opposition to electric current flow.
2. Igneous rocks generally have higher density, susceptibility, and resistivity compared to metamorphic and sedimentary rocks. This is because igneous rocks contain more mafic minerals and have undergone less alteration from their original state than other rock types. Factors like pore space,
The document discusses the history of glaciation. It explains that ice ages were first discovered in the 1830s and that ice cores have provided evidence of past climate changes over the last 800,000 years. Geological time is broken into periods like the Quaternary period, which includes the current Holocene epoch and the Pleistocene epoch during the last ice age. The causes of the glacial and interglacial cycles within the Pleistocene are thought to involve changes in the Earth's orbit and axis known as the Milankovitch cycles, as well as climate feedback mechanisms involving factors like albedo, cloud cover, and ocean currents. Short term climate fluctuations may also be influenced by solar activity and volcanic eruptions
1) The document discusses the geological action of wind and the landforms it creates through erosion, transportation, and deposition of materials.
2) Wind erosion occurs through deflation, abrasion, and attrition, which form erosional landforms like deflation hollows, ventifacts, yardangs, and pedestal rocks.
3) Transportation of eroded materials by wind leads to depositional landforms like barchans and other dune types that indicate the direction of prevailing winds. The geological action of wind thus shapes the surface of the Earth through both destructive and constructive processes.
The document discusses William Morris Davis's theory of geographic or geomorphic cycles. It explains that Davis proposed that landforms undergo three stages: youth, mature, and old age. In the youth stage, steep valleys are carved by rivers and streams. In the mature stage, valleys widen and streams meander. In the old stage, erosion reduces the landscape to a flat plain until renewed uplift restarts the cycle. The document also notes some criticisms of Davis's theory, such as that a full cycle has never been observed and climate variability can modify the erosion process.
Climatic geomorphology and morphogenetic regions Sadia Zaman
Climatic geomorphology examines the relationship between climate and landforms. It identifies that different climatic zones produce different landforming mechanisms and resultant landforms that reflect the dominant climate. According to climatic geomorphology theory, landforming processes are controlled by mean temperature, mean precipitation, and other climatic factors such as rainfall intensity, frost intensity, wind direction and power. The concept proposes that each climate type develops characteristic assemblages of landforms through distinctive geomorphic processes. Peltier divided the world into nine morphogenetic regions based on mean annual temperature and rainfall, with different combinations of these climatic parameters producing distinct weathering regions.
This document provides an overview of key concepts in geomorphology. It defines geomorphology as the study of landforms and discusses how landforms are shaped by tectonic and hydrologic processes. Early theories that invoked supernatural causes are contrasted with modern theories of uniformitarianism and plate tectonics. The roles of various controlling factors - including geomorphic agents, surficial materials, tectonic setting, and climate - are examined. Different types of crustal features like continents, mountain belts, shields, and continental shelves are also introduced.
This document defines and classifies different types of foliation in metamorphic rocks. It begins by defining foliation as a planar or curvi-planar fabric formed in metamorphic rocks. Foliations are classified genetically as primary, secondary, or inherited, and morphologically as spaced, continuous, or disjunctive. Key types of secondary foliation include cleavage, schistosity, slip cleavage, and shear cleavage. Foliations provide important information about the tectonic and metamorphic evolution of an area and help determine the geometry of folding. Different foliation types reflect variations in lithology and temperature during metamorphism and deformation.
This document discusses morphogenetic regions, which are areas classified based on dominant geomorphic processes influenced by climate. It provides context on the concept of regions and defines morphogenetic and functional regions. It then discusses geomorphology and climatic geomorphology, noting how climate affects landform development. Several theories on classifying morphogenetic regions are summarized, including those proposed by Peltier based on temperature and precipitation ranges, and Köppen based on vegetation zones. Dominant geomorphic processes are described for different proposed morphoclimatic zones.
Orogenesis is the process of mountain building that occurs during an orogeny. An orogeny involves tectonic processes like subduction and plate convergence that cause deformation and metamorphism of the Earth's crust, forming orogenic belts made of parallel rock structures. Orogenies can take tens of millions of years to build mountains and are associated with the development of foreland basins in front of the growing mountain range.
This document discusses various mechanisms of rock folding. It defines folding as the bending of rock strata due to compressional forces. There are several types of fold mechanisms including buckling, bending, flexure folding, flexural slip, flexural flow, passive flow, and kink folding. Each mechanism is influenced by factors like temperature, pressure, fluid properties, and the composition and texture of the rock. Buckling involves shortening of rock layers under lateral pressure. Bending involves applying force across layers to produce gentle folds. Flexural slip forms parallel concentric folds through buckling or bending with slip along layering.
This document provides an introduction to the course GEE-221: Geomorphology-I. It defines geomorphology as the scientific study of landforms and the processes that shape them. It discusses the importance of geomorphology for understanding natural hazards, landforms, and landscapes. The document also outlines various geomorphic processes including weathering, erosion, deposition, mass movement, faulting, folding, volcanism, earthquakes, landslides, diastrophism and metamorphism. These processes are classified as terrestrial or extra-terrestrial, exogenetic or endogenetic. The key agents and products of geomorphic processes are also introduced.
A sedimentary facies is a body of rock or sediment that is characterized by particular attributes that distinguish it from adjacent rock bodies. These attributes include lithology, color, texture, sedimentary structures, mineral/fossil content, and bed geometry. Together these attributes provide clues about the depositional environment. Different facies reflect different environments, such as beach/shallow marine facies indicating sandstone and offshore marine facies indicating shale. Facies analysis studies these attributes to interpret depositional environments and geological history at various scales.
This document defines and describes different types of lineations found in deformed rocks, which are linear structures that occur repetitively. It discusses three main types of lineations: form lineations related to geological structures like folds, boudins, and slickenlines; surface lineations defined by intersections or slip; and mineral lineations caused by the preferred orientation of mineral grains or aggregates. Specific examples of each lineation type are provided, and the usefulness of lineations in structural analysis to determine strain and slip directions is explained.
Sedimentary facies represent the original depositional environment and can be used to interpret changes in sea level. There are two main types of facies - lithofacies which describe rock characteristics, and biofacies which describe fossil composition. During a transgression, facies shift onshore as sea level rises. During a regression, facies shift offshore as sea level falls. A vertical succession of facies represents environments that were once laterally continuous according to Walther's Law. Global sea level changes are caused by continental glaciation and plate tectonics, while local changes involve vertical land movement or sediment supply.
This document discusses the distribution, stratigraphy, and economic importance of Archaean rocks in Madhya Pradesh, India. It describes how Archaean rocks are well exposed in several regions of India including South India and Madhya Pradesh. Within Madhya Pradesh, Archaean rocks are found in the Nagpur-Chhindwara region, Bilaspur-Balaghat region, Mahakoshal region, and Baster region. These rocks have significant economic importance as sources of important minerals like manganese, iron, and copper ores. Archaean rocks also provide building materials and are a major source of India's geodiversity.
The document discusses the classification of folds based on various parameters such as fold closure, symmetry, plunge, orientation of the axial plane, and nature of the hinge line. Folds are classified into different types including antiform, synform, symmetrical, asymmetrical, horizontal, plunging, upright, recumbent, and overturned folds based on these parameters. The classification schemes proposed by Fluety (1964) and Ramsay (1967) are also summarized.
Karst topography forms in areas with soluble rock like limestone and dolomite. Groundwater dissolves the rock through chemical processes, forming distinctive landforms. Key features include sinkholes, caves, underground streams, and karst plains. Karst regions exist worldwide, including parts of Europe, Asia, and North America, requiring soluble bedrock and adequate rainfall for dissolution to occur.
The document discusses several key factors that control landform development:
1) Geomorphic agents and processes such as weathering, erosion, and sediment transport affect how rocks and sediment are shaped over time.
2) The types of surficial materials present influences landform evolution.
3) The tectonic setting determines what rock materials are exposed and how they are distributed across the surface.
4) Climate determines the active geologic agents and affects the rates of physical and chemical weathering.
The document summarizes the Ngai Tahu legend of the creation of the Southern Alps, with the sky father Raki's sons turning to stone and forming the mountain peaks. It then discusses geologist Harold Wellman and his pioneering ideas around plate tectonics in New Zealand, including his proposal that rocks on opposite sides of the Alpine Fault were once joined before separating laterally. Wellman was considered the most influential New Zealand geologist of the 20th century for his original thinking that challenged accepted views.
The document presents a presentation on karst topography given by Ahmad Raza. It defines karst topography as areas with limestone or dolomite bedrock that have distinctive landforms formed by the dissolution of bedrock by water. It discusses the worldwide distribution of karst areas and the conditions required for karst formation. Key erosional landforms of karst include sinkholes, dolines, swallow holes, and caves. Depositional landforms include stalactites, stalagmites, and columns. Karst landscapes progress through youth, mature, and old stages as surface streams disappear underground over time. Karst is important for engineering projects, water resource studies, and paleoclimate research.
Davis and Penk proposed different models of the cycle of erosion. Davis' model involved three stages - youth, maturity, and old age - where a landscape evolves from high relief to a flat plain over time. Penk emphasized the relationship between uplift and erosion, with landforms resulting from their competition. Later theorists like King and Gilbert built on these ideas but acknowledged no single model explains all landscapes given different environments. While influential, both Davis and Penk's concepts have limitations and underwent criticism regarding assumptions about rates of uplift and erosion.
Mass wasting refers to the downslope movement of soil, rock debris, and bedrock under the force of gravity. It is a form of erosion and transportation that can occur slowly over geologic time or suddenly during catastrophic events. The main types of mass wasting are slides, flows, falls, and creep. Factors that influence mass wasting include slope angle, rock/soil type, water content, climate, earthquakes/volcanic activity, and pre-existing weaknesses in bedrock. Common landslide types are slumps, debris flows, rock slides, and debris slides/slumps. Creep is a very slow form of downslope movement caused by processes like wetting/drying, freezing/thawing, and
1. The document discusses concepts in geophysics including isostasy, density, susceptibility, and resistivity of rocks. Isostasy refers to equilibrium between the earth's lithosphere and asthenosphere. Density is a measure of how tightly packed molecules are in a material. Susceptibility measures a material's magnetization in response to an external magnetic field. Resistivity quantifies a material's opposition to electric current flow.
2. Igneous rocks generally have higher density, susceptibility, and resistivity compared to metamorphic and sedimentary rocks. This is because igneous rocks contain more mafic minerals and have undergone less alteration from their original state than other rock types. Factors like pore space,
The document discusses the history of glaciation. It explains that ice ages were first discovered in the 1830s and that ice cores have provided evidence of past climate changes over the last 800,000 years. Geological time is broken into periods like the Quaternary period, which includes the current Holocene epoch and the Pleistocene epoch during the last ice age. The causes of the glacial and interglacial cycles within the Pleistocene are thought to involve changes in the Earth's orbit and axis known as the Milankovitch cycles, as well as climate feedback mechanisms involving factors like albedo, cloud cover, and ocean currents. Short term climate fluctuations may also be influenced by solar activity and volcanic eruptions
1) The document discusses the geological action of wind and the landforms it creates through erosion, transportation, and deposition of materials.
2) Wind erosion occurs through deflation, abrasion, and attrition, which form erosional landforms like deflation hollows, ventifacts, yardangs, and pedestal rocks.
3) Transportation of eroded materials by wind leads to depositional landforms like barchans and other dune types that indicate the direction of prevailing winds. The geological action of wind thus shapes the surface of the Earth through both destructive and constructive processes.
The document discusses William Morris Davis's theory of geographic or geomorphic cycles. It explains that Davis proposed that landforms undergo three stages: youth, mature, and old age. In the youth stage, steep valleys are carved by rivers and streams. In the mature stage, valleys widen and streams meander. In the old stage, erosion reduces the landscape to a flat plain until renewed uplift restarts the cycle. The document also notes some criticisms of Davis's theory, such as that a full cycle has never been observed and climate variability can modify the erosion process.
Climatic geomorphology and morphogenetic regions Sadia Zaman
Climatic geomorphology examines the relationship between climate and landforms. It identifies that different climatic zones produce different landforming mechanisms and resultant landforms that reflect the dominant climate. According to climatic geomorphology theory, landforming processes are controlled by mean temperature, mean precipitation, and other climatic factors such as rainfall intensity, frost intensity, wind direction and power. The concept proposes that each climate type develops characteristic assemblages of landforms through distinctive geomorphic processes. Peltier divided the world into nine morphogenetic regions based on mean annual temperature and rainfall, with different combinations of these climatic parameters producing distinct weathering regions.
This document provides an overview of key concepts in geomorphology. It defines geomorphology as the study of landforms and discusses how landforms are shaped by tectonic and hydrologic processes. Early theories that invoked supernatural causes are contrasted with modern theories of uniformitarianism and plate tectonics. The roles of various controlling factors - including geomorphic agents, surficial materials, tectonic setting, and climate - are examined. Different types of crustal features like continents, mountain belts, shields, and continental shelves are also introduced.
This document defines and classifies different types of foliation in metamorphic rocks. It begins by defining foliation as a planar or curvi-planar fabric formed in metamorphic rocks. Foliations are classified genetically as primary, secondary, or inherited, and morphologically as spaced, continuous, or disjunctive. Key types of secondary foliation include cleavage, schistosity, slip cleavage, and shear cleavage. Foliations provide important information about the tectonic and metamorphic evolution of an area and help determine the geometry of folding. Different foliation types reflect variations in lithology and temperature during metamorphism and deformation.
This document discusses morphogenetic regions, which are areas classified based on dominant geomorphic processes influenced by climate. It provides context on the concept of regions and defines morphogenetic and functional regions. It then discusses geomorphology and climatic geomorphology, noting how climate affects landform development. Several theories on classifying morphogenetic regions are summarized, including those proposed by Peltier based on temperature and precipitation ranges, and Köppen based on vegetation zones. Dominant geomorphic processes are described for different proposed morphoclimatic zones.
Orogenesis is the process of mountain building that occurs during an orogeny. An orogeny involves tectonic processes like subduction and plate convergence that cause deformation and metamorphism of the Earth's crust, forming orogenic belts made of parallel rock structures. Orogenies can take tens of millions of years to build mountains and are associated with the development of foreland basins in front of the growing mountain range.
This document discusses various mechanisms of rock folding. It defines folding as the bending of rock strata due to compressional forces. There are several types of fold mechanisms including buckling, bending, flexure folding, flexural slip, flexural flow, passive flow, and kink folding. Each mechanism is influenced by factors like temperature, pressure, fluid properties, and the composition and texture of the rock. Buckling involves shortening of rock layers under lateral pressure. Bending involves applying force across layers to produce gentle folds. Flexural slip forms parallel concentric folds through buckling or bending with slip along layering.
This document provides an introduction to the course GEE-221: Geomorphology-I. It defines geomorphology as the scientific study of landforms and the processes that shape them. It discusses the importance of geomorphology for understanding natural hazards, landforms, and landscapes. The document also outlines various geomorphic processes including weathering, erosion, deposition, mass movement, faulting, folding, volcanism, earthquakes, landslides, diastrophism and metamorphism. These processes are classified as terrestrial or extra-terrestrial, exogenetic or endogenetic. The key agents and products of geomorphic processes are also introduced.
A sedimentary facies is a body of rock or sediment that is characterized by particular attributes that distinguish it from adjacent rock bodies. These attributes include lithology, color, texture, sedimentary structures, mineral/fossil content, and bed geometry. Together these attributes provide clues about the depositional environment. Different facies reflect different environments, such as beach/shallow marine facies indicating sandstone and offshore marine facies indicating shale. Facies analysis studies these attributes to interpret depositional environments and geological history at various scales.
This document defines and describes different types of lineations found in deformed rocks, which are linear structures that occur repetitively. It discusses three main types of lineations: form lineations related to geological structures like folds, boudins, and slickenlines; surface lineations defined by intersections or slip; and mineral lineations caused by the preferred orientation of mineral grains or aggregates. Specific examples of each lineation type are provided, and the usefulness of lineations in structural analysis to determine strain and slip directions is explained.
Sedimentary facies represent the original depositional environment and can be used to interpret changes in sea level. There are two main types of facies - lithofacies which describe rock characteristics, and biofacies which describe fossil composition. During a transgression, facies shift onshore as sea level rises. During a regression, facies shift offshore as sea level falls. A vertical succession of facies represents environments that were once laterally continuous according to Walther's Law. Global sea level changes are caused by continental glaciation and plate tectonics, while local changes involve vertical land movement or sediment supply.
This document discusses the distribution, stratigraphy, and economic importance of Archaean rocks in Madhya Pradesh, India. It describes how Archaean rocks are well exposed in several regions of India including South India and Madhya Pradesh. Within Madhya Pradesh, Archaean rocks are found in the Nagpur-Chhindwara region, Bilaspur-Balaghat region, Mahakoshal region, and Baster region. These rocks have significant economic importance as sources of important minerals like manganese, iron, and copper ores. Archaean rocks also provide building materials and are a major source of India's geodiversity.
The document discusses the classification of folds based on various parameters such as fold closure, symmetry, plunge, orientation of the axial plane, and nature of the hinge line. Folds are classified into different types including antiform, synform, symmetrical, asymmetrical, horizontal, plunging, upright, recumbent, and overturned folds based on these parameters. The classification schemes proposed by Fluety (1964) and Ramsay (1967) are also summarized.
Karst topography forms in areas with soluble rock like limestone and dolomite. Groundwater dissolves the rock through chemical processes, forming distinctive landforms. Key features include sinkholes, caves, underground streams, and karst plains. Karst regions exist worldwide, including parts of Europe, Asia, and North America, requiring soluble bedrock and adequate rainfall for dissolution to occur.
The document discusses several key factors that control landform development:
1) Geomorphic agents and processes such as weathering, erosion, and sediment transport affect how rocks and sediment are shaped over time.
2) The types of surficial materials present influences landform evolution.
3) The tectonic setting determines what rock materials are exposed and how they are distributed across the surface.
4) Climate determines the active geologic agents and affects the rates of physical and chemical weathering.
The document summarizes the Ngai Tahu legend of the creation of the Southern Alps, with the sky father Raki's sons turning to stone and forming the mountain peaks. It then discusses geologist Harold Wellman and his pioneering ideas around plate tectonics in New Zealand, including his proposal that rocks on opposite sides of the Alpine Fault were once joined before separating laterally. Wellman was considered the most influential New Zealand geologist of the 20th century for his original thinking that challenged accepted views.
This document discusses identifying different types of faults in a landscape, including strike-slip, normal, and reverse faults. It provides references to a textbook on active tectonics that describes the features of each fault type and includes an example of an emergent reverse fault and propagating fold. The work was supported by the National Science Foundation.
This document provides an overview of Central Asia, including its landlocked location, historical role in Eurasia, and increased prominence since 9/11. It describes Central Asia's physical geography of highlands, plains, basins, deserts and shrinking lakes. Population is sparsely distributed, with most living in mountain valleys, oases, or practicing nomadism. The region has a variety of climates and environments that support different subsistence patterns.
political geography bu m waseem noonari 03337091493m waseem noonari
This document provides definitions and outlines concepts related to political geography. It begins by defining states, nations, and nation-states. It then discusses the role of colonialism in shaping the modern political map, highlighting the Scramble for Africa in the late 19th century. Definitional complexities are explored through examples of multinational states and stateless nations. The document also discusses the importance of absolute and relative location, as well as strategic locations. Other concepts covered include capital cities, alliances between states, and international organizations like the United Nations.
The document discusses the Bermuda Triangle and various theories about disappearances that have occurred there. It provides background on the location of the Bermuda Triangle between Puerto Rico, Florida, and the Bermuda Islands. It then lists several hypotheses that have been proposed to explain the mysterious disappearances, such as unusual magnetic fields, methane gas eruptions, rogue waves, and strange atmospheric conditions. The document also provides some facts about the number of planes and ships lost in the Bermuda Triangle and examples of specific incidents like Flight 19.
Agriculture is the backbone of Pakistan's economy, providing employment and contributing 24% to GDP. However, Pakistan's agricultural sector faces many problems including a feudal land ownership system, underutilization of land and labor, lack of irrigation infrastructure and water supply, illiterate farmers, inadequate research and use of inputs, and natural disasters. The government is taking steps to address these issues through consolidating land holdings, increasing credit access, improving irrigation, promoting mechanization and use of improved seeds, expanding education, and implementing proper agricultural policies.
Deserts are defined as regions that receive less than 10 inches of annual precipitation. They cover about one fifth of the Earth's surface and can form due to factors like proximity to mountain ranges, prevailing winds, and ocean currents. Common landforms in deserts include alluvial fans and playa lakes. Erosion processes shape desert landscapes through wind erosion like deflation and abrasion, as well as flash floods when rain does occur. Wind also forms various dune types like barchan and longitudinal dunes from sand transport.
The document lists the names of parliaments or legislative bodies from various countries around the world. Each entry includes the country name followed by the name of its parliament or national assembly. There are over 50 entries in total, ranging from Afghanistan's Loya Jirga to Uzbekistan's Majlis.
This document provides an overview of the geography of Pakistan. It discusses the country's provinces and special areas, as well as its major cities and regions. Pakistan has diverse terrain that includes mountains, deserts, and fertile plains watered by rivers like the Indus. The document outlines Pakistan's climate, agriculture, transportation infrastructure, energy resources, and international borders. In summary, it covers the key physical features and administrative divisions of Pakistan's landscape.
european union m waseem noonari geography dept salu khairpur sindh pk 92333...m waseem noonari
The European Union is an economic and political union of 27 member states that are located primarily in Europe. It operates as a single market through common policies and by allowing free movement of goods, capital, services, and people between member states. Key EU institutions include the European Commission, which acts as the executive branch, the Council of the European Union, which makes decisions, and the European Parliament, which is elected by EU citizens. 15 member states have also adopted the euro as their common currency. The EU was established after World War 2 to promote cooperation and peace between European countries. It has since grown to include 27 members through several rounds of enlargement.
The document discusses the rise and fall of several historical empires and the lasting impacts of imperialism and colonization. It covers the Roman Empire, Islamic empires like the Ottoman Empire, Chinese dynasties, African empires like Great Zimbabwe, Mongol Empire, and European colonial empires like the British, Spanish, French, and Russian empires. It also examines the economic and geographic influences each empire had as well as the vestiges that remain after their falls, such as languages, religions, and political systems.
NATO is a political and military alliance of 28 European and North American countries. Formed in 1949, NATO's original purpose was to deter Soviet expansionism. Today, NATO promotes cooperation and dialogue while protecting its members, combating threats, and building peace worldwide through crisis management operations. Key functions include collective defense, in which an attack against one member is considered an attack against all, and consensus-based decision making. NATO has undertaken missions including peacekeeping in Kosovo and security operations in Afghanistan.
The document discusses how language, ethnicity, and religion can both link and divide regions of the world. It provides several examples:
- The Arab world is largely unified by the Arabic language, while countries like Iran do not share this language. Hispanic America shares the Spanish language.
- Ethnic conflicts have occurred in the Balkans, Rwanda, and Cyprus due to differences between groups like Serbs/Croats/Bosniaks, Hutus/Tutsis, and Greek Cypriots/Turkish Cypriots.
- Religious differences have caused conflicts over Kashmir between Hindus and Muslims and in Northern Ireland between Protestants and Catholics, while Jerusalem is claimed as a holy site by Jews, Christians
Pakistan studies pak301 power point slides lecture 02m waseem noonari
Pakistan has a diverse geography that has influenced its culture. Geographically, it consists of regions like Punjab and Sindh, as well as mountains, deserts, seas and plains. It is crossed by several rivers like the Indus and its tributaries. Culturally, Pakistan has a multi-cultural society with many languages, religions, castes and tribes coexisting in both rural and urban settings. Its culture is also socially diversified between rich and poor as well as different occupations. This diversity of culture combined with its geographical features have shaped Pakistan's political development.
Physical Geography Lecture 17 - Oceans and Coastal Geomorphology 120716angelaorr
This document discusses various topics related to coastal geomorphology including ocean currents, tides, waves, and the landforms shaped by coastal processes. It describes how tides are caused by the gravitational pull of the moon and sun. Spring tides occur when these three bodies are aligned and produce the highest tides, while neap tides occur at right angles and have lower tides. Extreme tides over 15 meters occur in the Bay of Fundy. Waves are affected by factors like fetch, wind strength, and duration. Refraction disperses wave energy at headlands and concentrates it in bays, shaping distinctive coastal landforms. Human structures can disrupt sediment flows and cause shoreline erosion over time.
Pakistan can be divided into three main hydrological units: the Indus basin, the Karan desert, and the arid Makran coast. There are 24 rivers in Pakistan, with the largest being the Indus River. Dams are constructed across rivers to control water flow for purposes like irrigation, hydroelectric power, and flood control. Some of Pakistan's major dams include Mangla Dam on the Jhelum River, Tarbela Dam on the Indus River, and Warsak Dam on the Kabul River.
The document discusses salinity and the distribution of salt concentrations in the world's oceans. It notes that the Atlantic Ocean generally has the highest salinity, around 3.5% on average globally. Regions with higher salinity include the Red Sea and Dead Sea, while areas with lower salinity include near river mouths and polar regions with ice melt. The source of ocean salts is from erosion of land rocks over millions of years. Salinity affects ocean properties like density and influences the types of organisms that can survive in different waters.
The document summarizes the history and structure of the Commonwealth of Nations. It began in the late 19th century as Britain's colonies gained independence and became dominions with self-government. Over time, declarations established the modern Commonwealth as a voluntary association of equal members united by common values of democracy, human rights, and rule of law. The Commonwealth now includes 53 member countries with over 1.7 billion people. While originally centered around Britain, most members are now republics. The Commonwealth is held together by shared history, language, and democratic traditions, and works to promote prosperity, democracy and international cooperation among its diverse members.
Mont Blanc is an international brand that sells luxury writing instruments, watches, eyewear, jewelry, fragrances, and leather goods in over 70 countries through authorized retailers and 360 boutiques worldwide. The brand is opening a new boutique in Argentina in October 2010 to represent Mont Blanc's status as an icon of high quality writing for over 100 years, as symbolized by its distinctive white star logo.
This document provides an overview of geomorphology, the study of landforms and the processes that shape Earth's surface. It discusses key topics in geomorphology including the importance of understanding landforming processes, geologic timescales, physiographic provinces and the concept of scale in landforms. The document traces the history of geomorphic thought from early observations and hypotheses to modern quantitative approaches. It also covers important concepts in geomorphology such as equilibrium, base level, graded stream profiles, and coastal equilibrium.
Topography, landform and geomorphology-Geomorhology ChapterKaium Chowdhury
This document provides definitions and information about topography, landforms, and geomorphology. It defines topography as the elevation and relief of the Earth's surface, landforms as the topographic features, and geomorphology as the study of earth surface processes and landforms. It discusses various landforms including those formed by tectonic, depositional, weathering, erosion, and mass wasting processes. It also covers related topics like uniformitarianism, the genetic classification of landforms, crustal orders of relief, and important deformation processes like folding and faulting.
The document discusses weathering and the weathering profile. It notes that weathering breaks down and loosens rock, setting the stage for landscape shaping. The weathering profile consists of different layers - deeply fractured bedrock, weathered rock, saprolite (loose but retaining structure), and mobile regolith at the surface. Factors like strength and mobility define these layers. Weathering is influenced by processes like thermal stress, fractures, frost cracking, and plant roots, which break rock into smaller pieces. Measuring denudation rates provides a way to quantify weathering, with total denudation equaling dissolved and particulate mass losses.
This document provides an introduction to the field of geomorphology. It defines geomorphology as the study of landforms and the processes that create them. Some key points made in the document include:
- Geomorphology examines both the natural physical features of the Earth's surface like mountains, valleys, and river deltas, as well as the processes that form and modify these landforms over various temporal and spatial scales.
- There are two main approaches in geomorphology - historical geomorphology, which focuses on the evolution of landscapes over time, and process geomorphology, which examines the mechanics of geomorphic processes.
- Geomorphology is relevant to fields like geology, engineering, archaeology and
This document provides an introduction to geomorphology. It defines geomorphology as the study of landforms and the processes that create them. It discusses different landforms seen on Earth's surface like mountains, hills, and river valleys. It explains that landforms are shaped by natural physical processes involving movement of materials. The document also outlines different tools and techniques used in geomorphological studies, like satellite images, digital models, and dating methods. It discusses various applications of geomorphology and reasons for its importance, including contributions to fields like geology, engineering, archaeology and more. Finally, it introduces different concepts in geomorphology like the geomorphic cycle, historical vs process approaches, and endogenic and exogenic forces.
Geomorphological indicators of climate change zewde alemayehu tilahunzewde alemayehu
The document discusses various geomorphological indicators of climate change. It begins by introducing geomorphology and its subfields including climatic geomorphology, fluvial geomorphology, tropical geomorphology, periglacial geomorphology, tectonic geomorphology, and coastal geomorphology. It then discusses specific geomorphological indicators of climate change such as lake growth at glacier margins as glaciers recede, increases in debris flows due to heavier rainfall, paraglacial adjustment of moraines as ice melts, increases in high altitude rock falls and avalanches, and ice falls and avalanches as glacial cover decreases. The document concludes by discussing indicators related to glacier change such as
Geomorphology at a glance: Major landformsP.K. Mani
Geomorphology, Major landforms, Genetic landform classifications, Volcanic landforms, River Systems and Fluvial Landforms, Aeolian Landforms, Glacial Landforms
This document discusses geologic time and stratigraphy. It begins by outlining the tools used, including principles of stratigraphy and the geologic timescale. It then discusses how geology establishes the relative and absolute ages of events by placing rocks and fossils in chronological order. Key methods discussed include lithostratigraphy, biostratigraphy, magnetic stratigraphy, and radiometric dating. The document also outlines the major divisions of the geologic timescale from eons to epochs. It notes how fossil evidence and major extinction events define era boundaries.
This document provides information on geologic processes and continental drift theory. It discusses topics like seismic waves, the mechanism behind earthquakes, and the destructive effects of earthquakes. It also covers volcanic eruptions, describing the different types of eruptions and their environmental impacts. Key geologic processes are outlined such as weathering, erosion, deposition, and plate tectonics.
This chapter discusses two main processes that shape the Earth's surface topography: climatic and vegetative zonation, and geographical cycles. Zonation divides the Earth into climate zones from poles to equator based on factors like latitude and vegetation. Geographical cycles describe the evolution of landscapes through youth, maturity, and old age stages. While zonation and cycles were originally seen as competing theories, they are now viewed as often complementary. Zonation has influenced paleogeography and sedimentation since life became widespread, while cycles better describe some arid landscapes. Both processes, along with tectonics and eustatic sea level changes, have interacted to sculpt the Earth's surface over geological time.
Geomorphology is the scientific study of landforms and the processes that shape them. It evolved from a descriptive field focused on classifying landforms to a more quantitative science that treats landforms as complex systems and studies the processes that create and change them, such as plate tectonics, weathering, erosion, and deposition. Geomorphologists seek to understand past and current shaping of the Earth's surface through observation, experimentation, and modeling.
Plate Tectonics and environment geology, minerals and rock, ecology and geology Thomas Chinnappan
This document summarizes key aspects of plate tectonics and how it relates to the environment, minerals, rocks, and ecology. It describes how plate tectonics theory explains the movement of tectonic plates in the earth's lithosphere. There are three main types of plate boundaries: divergent where plates move apart, convergent where they collide, and transform faults where motion is horizontal. Plate tectonics causes volcanism and mountain building which can influence climate patterns. Weathering and mining impact the environment and change rocks and minerals over time. Environmental factors like temperature and rainfall also control the rate of rock weathering. Ecology differs from geology in that ecology studies the relationships between living organisms and their habitat,
Geomorphology is the study of landforms and the processes that shape the Earth's surface. Some key concepts in geomorphology include:
- The present is key to understanding the past, as the same surface processes have operated over geologic time.
- Geological structure influences landform evolution and is reflected in landforms.
- Geomorphic processes each develop characteristic landforms.
- Landforms evolve in an orderly sequence as erosional processes act over time.
- Geomorphic systems dominate large areas and landscapes can be summarized in physiographic maps.
About Carbonate Diagenesis: Meteoritic diagenesis is a transformation that occurs at or near the Earth’s surface in strata influenced or penetrated by water of recent atmospheric origin. The meteoritic environment is generally divided into unsaturated (vadose) and saturated (phreatic) zones separated by a water table (see top diagram, opposite page). The interfaces between meteoritic surface fluids and layers filled with other pore fluids (seawater or groundwater) are “mixing zones” that may have special diagenetic properties.
Many, perhaps even most, shallow marine carbonate deposits are subject to meteoric diagenesis, either by the buildup of sediments above sea level or by a subsidence of sea level that exposes the platform carbonates. In addition, meteoric water can circulate far below the land surface and alter carbonate deposits that are far older than the exposure interval. Meteoric processes typically occur over periods of hundreds to millions of years.
Method of the sequence stratigraphic analysis.pdfSujan Pandey
This document provides an overview of sequence stratigraphic analysis methods. It discusses key concepts like facies, facies associations, facies models, depositional environments, Walther's Law, paleocurrent analysis, pedology, ichnology, and well logs. The document emphasizes that facies analysis is fundamental to sequence stratigraphy as it provides clues for reconstructing paleogeography and depositional environments over time in response to changes in base level.
This document provides an overview of structural geomorphology and the key surface and subsurface processes that shape the Earth's landscapes. It discusses global geomorphology and the intersection between climatic, hydrologic, and biologic surface processes with underlying geologic processes. Specific topics covered include plate tectonics and the different landforms that form at divergent, convergent and transform plate boundaries. The document also discusses weathering processes, the factors that influence them, and characteristic landforms formed by weathering such as exfoliation domes and rock basins. Finally, it covers slope stability and the different types of landslides that can occur based on material type and movement.
1) Sequence stratigraphy involves subdividing stratigraphy into sequences bounded by unconformities and identifying their generating causes like tectonism or eustasy.
2) Key methods for analyzing sequence stratigraphy include mapping unconformities, stratigraphic terminations, and cyclic facies changes to identify sequences and depositional systems tracts.
3) Sequences reflect cycles of relative sea level change from rises and falls, which are driven by eustasy or tectonism, and generate predictable depositional responses.
This document outlines 9 fundamental concepts in geomorphology. It introduces geomorphology as the description and interpretation of earth's landforms. Some key concepts discussed are:
- The principle of uniformitarianism, which states that geological processes have operated consistently over time, though intensities may have varied.
- Geological structure strongly influences landform evolution and is reflected in topography.
- Individual geomorphic processes leave distinctive imprints and develop characteristic landform assemblages.
- Landforms develop through successive stages as erosional processes act on the earth's surface over time.
- Most of the world's topography developed during the Pleistocene and is influenced by past geological and climatic changes.
UNIT-V Slope Stability - Land Slides.pptmythili spd
This document provides information on landslides, slope stability, retaining structures, and major disasters in India. It defines landslides as permanent downward and outward movements of soil and rock under gravitational forces. Slope stability is analyzed using factors of safety to determine if a slope is safe or unstable. Methods to stabilize slopes include regrading, drainage, incorporating structures, and loading the toe. Retaining structures help ensure slope stability but are difficult to construct on moving slopes. Major disasters in India include earthquakes, floods, droughts, and cyclones that have caused thousands of deaths and widespread damage.
Similar to Geomorphology m waseem noonari salu khirpur (20)
This document discusses geomorphic processes that shape the Earth's surface. It begins by explaining that the surface is uneven due to internal and external forces changing conditions over time. Endogenic forces from within Earth like volcanism and diastrophism oppose exogenic surface processes, keeping some relief variations. Weathering, erosion, deposition and mass wasting are driven by factors like climate, rock type and topography and work to gradually modify the surface.
This document contains a list of phrases and proverbs organized alphabetically from A to H. It provides the saying, phrase or proverb and a short explanation or interpretation of its meaning. Each entry includes the phrase or proverb, followed by a brief definition or example of how it is commonly understood and applied. The document serves as a reference list for familiar phrases and the contextual meanings they carry.
This document contains 20 multiple choice questions from past papers of the Islamiyyat subject for the years 2005 to 2011. The questions cover topics related to the Quran, Hadith, Islamic law, Islamic history and rituals such as Hajj. For each year from 2005 to 2011, 10 multiple choice questions are provided along with the corresponding answers. The questions appear to be from entrance exams to assess knowledge of Islamic studies.
This document contains 20 multiple choice questions from a 2001 geography exam in Pakistan. It tests knowledge of basic geography topics like landforms, climate, oceans, maps, and countries/cities. A second document contains 20 additional multiple choice questions from the 2002 geography exam, covering human geography topics such as early civilization, population distribution, and country profiles.
WATER MANGMENT A SOLUTION TO PAKISTAN WATER SCARCITY m waseem noonari
This document discusses water management solutions for Pakistan's water scarcity issues. It notes that Pakistan's population is growing while available water resources are decreasing. The key points made are:
1. Pakistan needs better management of its water resources through small-scale solutions like maintaining irrigation channels, constructing small dams and run-of-river structures, and increasing storage capacity in river beds and reservoirs.
2. A public-private partnership (PPP) model is proposed for water management, with federal, provincial, and district water authorities responsible for large-scale river management and smaller-scale canal maintenance respectively, funded through water user fees.
3. Improved maintenance of canals and channels through community participation can reduce water
Domestic water pollution_among_local_communities_im waseem noonari
Domestic water pollution is a major problem among local communities in Nigeria. The main causes include improper waste disposal from homes, markets, abattoirs and oil spills. Homes dump sewage, trash and other wastes directly into water sources. Local markets dump food waste, cosmetics and butcher waste into rivers and wells. Abattoirs release blood and feces into waterways. Oil spills from pipelines contaminate water. This widespread pollution has led to many water-borne diseases in communities and elevated heavy metal levels in water sources. Improved sanitation, waste management education, water infrastructure funding, and enforcement of regulations are needed to address domestic water pollution in Nigeria.
Pakistan faces serious challenges of water scarcity and low agricultural productivity due to a growing population, limited arable land, and shrinking water resources. The document discusses developing Pakistan's desert and semi-desert areas through water-saving technologies and practices to improve food security, livelihoods, and sustainable agriculture. It provides examples of successful desert agriculture in other countries and proposes strategies for Pakistan such as expanding irrigation infrastructure, adopting conservation practices, and establishing authorities and public-private partnerships to develop desert regions like Thal through drip irrigation and water storage schemes.
South Asia has a population of over 1.5 billion people as of 2010. The region is experiencing rapid demographic changes, including a falling infant mortality rate, though it varies significantly between countries. The total fertility rate is around 2.78 children per woman. The annual population growth rate for the region was approximately 1.43% in 2012. However, poverty remains widespread, with over 40% of the population living below the international poverty line. Resources are also becoming increasingly scarce as the population continues to rise dramatically.
- The document discusses the independence of India and Pakistan from British rule in 1947. It summarizes the key leaders and events that led to the partition, including Gandhi's nonviolent resistance movement and Jinnah's call for a separate Muslim state of Pakistan. The partition resulted in mass violence and migration between the two newly formed countries. Kashmir remains a disputed territory between India and Pakistan.
Agriculture is the backbone of Pakistan's economy, providing employment and contributing 24% to GDP. However, Pakistan's agricultural sector faces many problems including a feudal land ownership system, underutilization of land and labor, lack of irrigation infrastructure, illiterate farmers, inadequate research and supplies. The government is taking steps to address these issues through consolidating land holdings, increasing credit access, improving irrigation, promoting mechanization and education.
Muhammad Waseem is seeking a position that allows him to face challenges and utilize his skills. He has a M.Sc and B.Sc in geography from S.A.L.U Khairpur. He has over 2 years of teaching experience and skills in Microsoft Office, English, Urdu, and Sindhi. His references include Prof. Muhammad Sharef Shaikh and Prof. Noor Hussain Chandio.
Clouds are formed when water evaporates and rises into the sky, cooling and collecting into different cloud types. There are three main cloud types - cirrus clouds high in the sky, stratus clouds low to the ground like fog, and puffy cumulus clouds. Clouds help regulate temperature and are part of the water cycle, as water evaporates from oceans and land and falls as precipitation like rain or snow.
This document discusses various geomorphic processes including endogenic processes like diastrophism and volcanism as well as exogenic processes like weathering, mass movement, erosion, and deposition. It provides details on different types of weathering such as mechanical, chemical, and biological weathering. The significance of weathering in forming soils and changing landforms is also mentioned. The document also discusses mass movement processes like creep, flow, sliding, and falling and the factors that influence their occurrence on slopes.
This document provides demographic details about the world population and Pakistan. It defines demography and notes that the world population reached 7 billion in 2011. It then summarizes population growth trends in Pakistan, including that Pakistan has a population of over 187 million as of 2011. Several key demographic statistics about Pakistan are presented, such as population density, birth and death rates, urbanization rates, gender ratios, and literacy rates.
Pakistan's tourism industry is small-scale currently but has growth potential. The country offers diverse landscapes and attractions including the Himalayan mountains, lakes, archaeological sites from ancient civilizations, forts, and places of religious and cultural significance. Developing tourism requires investment in infrastructure, marketing, and management of attractions while being mindful of environmental and social impacts. Key regions that attract domestic and foreign tourists include northern areas like Gilgit, Hunza, and Skardu for their mountain scenery as well as Murree, Swat, and Kaghan for summer retreats.
This document provides an overview of oceanography and its subfields:
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- The five principal oceans are the Pacific, Atlantic, Indian, Arctic, and Southern oceans.
- Oceanography involves the physical, chemical, biological, geological, and engineering aspects of the ocean.
- Important historical figures and voyages helped advance the field, including Darwin, Franklin, the Challenger expedition, and Cousteau.
The document summarizes the countries of Southeast Asia. It divides the region into two subregions - the mainland and insular Southeast Asia. The mainland includes Vietnam, Cambodia, Laos, Thailand and Myanmar, which are characterized by Buddhism and a multicultural landscape. Insular Southeast Asia contains the fragmented states of Malaysia, Indonesia, the Philippines, Singapore and Brunei, which were all formerly European colonies and have a predominantly Muslim population. Key details are provided on the geography, history, demographics and economies of each individual country.
evalution of drinking water ofcity mehrabpur and its surronding physical and ...m waseem noonari
This document discusses a study evaluating various physical and chemical parameters of drinking water in Mehrabpur City, Pakistan. The study aims to analyze water samples for parameters like pH, temperature, conductivity, chlorides, total dissolved solids, alkalinity, and concentrations of essential, trace, and toxic metals. Over 100 groundwater samples were collected from locations across Mehrabpur City and analyzed using sophisticated instruments. The results found that chloride concentrations varied across samples but some exceeded WHO standards. The study aims to assess water quality and potential contamination sources in Mehrabpur City.
The binding of cosmological structures by massless topological defectsSérgio Sacani
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
Current Ms word generated power point presentation covers major details about the micronuclei test. It's significance and assays to conduct it. It is used to detect the micronuclei formation inside the cells of nearly every multicellular organism. It's formation takes place during chromosomal sepration at metaphase.
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptxMAGOTI ERNEST
Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
Brine shrimp (Artemia spp.) are used in marine aquaculture worldwide. Annually, more than 2,000 metric tons of dry cysts are used for cultivation of fish, crustacean, and shellfish larva. Brine shrimp are important to aquaculture because newly hatched brine shrimp nauplii (larvae) provide a food source for many fish fry (Mozanzadeh et al., 2021). Culture and harvesting of brine shrimp eggs represents another aspect of the aquaculture industry. Nauplii and metanauplii of Artemia, commonly known as brine shrimp, play a crucial role in aquaculture due to their nutritional value and suitability as live feed for many aquatic species, particularly in larval stages (Sorgeloos & Roubach, 2021).
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...AbdullaAlAsif1
The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an intriguing case of relatively low fecundity, raising questions about potential compensatory reproductive strategies employed by this species. Our study delves into the examination of fecundity and the Gonadosomatic Index (GSI) in the Pygmy Halfbeak, D. colletei (Meisner, 2001), an intriguing viviparous fish indigenous to Sarawak, Borneo. We hypothesize that the Pygmy halfbeak, D. colletei, may exhibit unique reproductive adaptations to offset its low fecundity, thus enhancing its survival and fitness. To address this, we conducted a comprehensive study utilizing 28 mature female specimens of D. colletei, carefully measuring fecundity and GSI to shed light on the reproductive adaptations of this species. Our findings reveal that D. colletei indeed exhibits low fecundity, with a mean of 16.76 ± 2.01, and a mean GSI of 12.83 ± 1.27, providing crucial insights into the reproductive mechanisms at play in this species. These results underscore the existence of unique reproductive strategies in D. colletei, enabling its adaptation and persistence in Borneo's diverse aquatic ecosystems, and call for further ecological research to elucidate these mechanisms. This study lends to a better understanding of viviparous fish in Borneo and contributes to the broader field of aquatic ecology, enhancing our knowledge of species adaptations to unique ecological challenges.
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skills
Nucleophilic Addition of carbonyl compounds.pptxSSR02
Nucleophilic addition is the most important reaction of carbonyls. Not just aldehydes and ketones, but also carboxylic acid derivatives in general.
Carbonyls undergo addition reactions with a large range of nucleophiles.
Comparing the relative basicity of the nucleophile and the product is extremely helpful in determining how reversible the addition reaction is. Reactions with Grignards and hydrides are irreversible. Reactions with weak bases like halides and carboxylates generally don’t happen.
Electronic effects (inductive effects, electron donation) have a large impact on reactivity.
Large groups adjacent to the carbonyl will slow the rate of reaction.
Neutral nucleophiles can also add to carbonyls, although their additions are generally slower and more reversible. Acid catalysis is sometimes employed to increase the rate of addition.
3D Hybrid PIC simulation of the plasma expansion (ISSS-14)
Geomorphology m waseem noonari salu khirpur
1. 1
Lecture 6: Geomorphology
• Questions
– What is geomorphology? What are the relationships
between elevation, slope, relief, uplift, erosion, and
isostasy?
– How do you measure the rates of geomorphic
processes?
– What does geomorphology have to do with tectonics?
• Reading
– Grotzinger et al. chapters 16, 22
Basic principle:
Every feature of the landscape is
there for a reason. We just have
to be smart enough to figure out
what the reason is.
2. 2
What is Geomorphology?
• Geomorphology is the study of landforms, i.e. the
shape of the Earth’s surface. It attempts to explain
why landscapes look as they do in terms of the
structures, materials, processes, and history
affecting regions.
• Geomorphology relates to all the other disciplines
of geology in two directions:
– Tectonics, petrology, geochemistry, stratigraphy, and
climate determine the geomorphology of the earth and
its regions by controlling the principal influences on
landscape.
– Therefore evidence from observations of the landscape
in turn constrain the tectonic, petrologic, geochemical,
stratigraphic, and climatic history of the earth and its
regions.
3. 3
Uses of geomorphology
• Consider how frequently we infer the geologic history
of a region from observation of the landforms.
• We will see many examples on our field trip:
– Tectonic motions create geomorphic features like fault scarps and
grabens; from observation of scarps and grabens we infer the sense of
tectonic motions and something about their ages.
– Volcanic activity creates calderas; from the form of the caldera we learn
about the mechanism of eruption.
– Granite weathers to rounded jointstones; from observation of the shape of
boulders and outcrops we can quickly map granite plutons; from the shape
of these rocks we infer how they joint and how they chemically weather.
– Resistant and weak strata determine the shapes of cliffs; from distant
observations of cliff shapes and local knowledge of stratigraphy, we can
map outcrops as far as the eye can see.
– Glacial processes create geomorphic expressions such as moraines; from
the position, form, and age of the moraines we learn about paleoclimate
and the nature of glaciers.
4. 4
Geomorphology in the rock cycle
• Every part of the
rock cycle that
occurs at the
Earth’s surface has
geomorphic
consequences
5. 5
Relevance of geomorphology
• Geomorphology is important because people live on
landforms and their lives are affected (sometimes
catastrophically) by geomorphic processes:
• Slope determines whether soil accumulates and makes arable land
• Slope stability controls landslides
• Mountains drastically affect the weather: rainshadows, monsoons
• This is also a two-way process: Human action is one of
the major processes of geomorphic evolution:
• People have been building terraced hillsides for thousands of years
• People dam rivers, drain groundwater, engineer coastlines
• People plant or burn vegetation on a huge scale
• People are paving the world
• People are changing the climate
6. 6
Geomorphic Concepts
• Important: a mountain is a feature of relief, not elevation (a high area of
low relief is a plateau)
– Slope controls the local stability of hillsides and sediment
transport
– Relief controls the regional erosion rate and sediment yield
– Elevation directly affects erosion and weathering only through
temperature, however, high elevation and high relief are
generally pretty well-correlated (with glaring exceptions, like
Tibet and the Altiplano)
• Elevation: height above sea level
• Slope: spatial gradients in
elevation
• Relief: the contrast between
minimum and maximum
elevation in a region
How high is this mountain?
7. 7
Geomorphic Concepts
• Uplift/subsidence
– vertical motions of the crust (i.e., of material points)
• Accumulation/denudation
– vertical change in the position of the land surface with respect
to material points in the bedrock.
• Important: the net rate of change in elevation of the
land surface is the sum of uplift/subsidence rate and
accumulation/denudation rate.
Uplift
Denudation ∆ελεϖατιον =
Υπλιφτ + ∆ενυδατιον
Ελεϖατιον
8. 8
Geomorphic Concepts
• Isostasy
– The result of Archimedes’ principle of buoyancy acting on
the height of the land surface in the limit of long timescale
(fluid-like mantle below the depth of compensation) and long
lengthscale (longer than the flexural wavelength of the
lithosphere).
– The total mass per unit area above some depth of
compensation (in the asthenosphere) should be globally
constant.
– Areas that satisfy the principle of isostasy are called
isostatically compensated.
9. 9
Geomorphic Concepts
• Variation in topography can be compensated through two end-
member mechanisms: differences in the thickness of layers or
differences in the density of layers.
– Isostatic compensation through density differences is Pratt
isostasy (in the pure form each layer is of constant thickness).
– Isostatic compensation through differences in the thickness of
layers (where the layer densities are horizontally constant) is
Airy isostasy.
Air ~0 Air ~0
10. 10
Geomorphic Concepts
• In reality, both mechanisms operate together: neither the
thickness nor the density of the crust is constant.
• However, since the density contrast between crust and mantle is
larger than most internal density differences within either crust
or mantle, the dominant mechanism of isostatic compensation is
variations in crustal thickness, i.e. Airy isostasy.
11. 11
Geomorphic Concepts
• Items for speculation:
– Why is the top of the ocean crust lower than the top of the
continental crust?
– Why is Iceland above sea level?
– Are subduction zone trenches isostatically compensated?
– What controls how long it takes to achieve isostatic
compensation?
– What controls the lengthscale over which isostasy operates?
– What do gravity anomalies have to do with isostasy?
– What happens when you put an ice-sheet on a continent?
What happens when you take it off?
12. 12
Drainage networks and Catchment Areas
• By mapping local
maxima (divides) in
topography, natural
terrains can always be
divided, at all scales
(from meters to 1000
km), into catchment
areas, each exited by one
principal drainage, into
which surface runoff is
channeled
• This is not a necessary
property of any
surface…it is the result
of processes that act to
shape the landscape
13. 13
Geomorphic Concepts
• Fractal geometry
– the forces that shape landscapes are often scale-independent
and lead to hierarchical regularity across scale, often with
fractional scaling relations, hence fractals. The classic
examples:
• Length of a coastline: coastlines get longer when measured with
shorter rulers.
• Branching networks: drainage channels come in all sizes, and join
together to produce networks whose branching statistics are fractal.
14. 14
“Process” geomorphology
• Quantitative, physically based analysis of morphology
in terms of endogenic and exogenic energy sources
• Basics of process geomorphology
– 1) Assume balance between forms and process (equilibrium
and quasi-equilibrium)
– 2) Balance created and maintained by the interaction between
energy states (kinetic and potential); force and resistance.
– 3) Changes in force-resistance balance may push the
landscape and processes too far: thresholds of change exist:
fundamental change of process and thus form.
– 4) Processes are linked with multiple levels of feedback.
– 5) Geomorphic analysis occurs at multiple spatial and
temporal scales.
15. 15
Process
geomorphology
• An example of a
quantifiable
process: hillslope
evolution
• What controls
stability of a
slope? Lithology
and water, mostly
16. 16
Hillslope evolution:
qualitative approach
Some rocks are
resistant to erosion
(they form cliffs),
some are weak (they
form slopes).
Resistant and weak
are qualitative terms,
but useful for
describing landscape
evolution.
17. 17
Hillslope evolution: quantitative approach
• In transport limited situations,
where slope failure does not
occur, evolution of scarps
resembles solutions of the
diffusion equation
∂h
∂t
= D
∂ 2
h
∂x2
∂h
∂t
= C
∂h
∂x
• Physically, this claims that flux of material is proportional to slope
gradient, and slope gradient changes due to flux of material…a diffusive
process.
• Where the slope is concave down it is eroding. Where it is concave up it
is aggrading.
• If you know the “diffusivity of topography” for a region, you can date
fault scarps and terrace edges by the relaxation of their shape.
• However, once a slope reaches a steady profile, or where the limitation is
not transport but slope stability, hillslopes propagate without change in
shape, a wave equation:
18. 18
Hillslope evolution:
quantitative approach
• When does a soil-covered slope
fail and become a stream channel?
– A model for the thickness of soil
cover on every part of a landscape
can be developed by combining a
criterion for failure of a soil layer
with topography and hydrology.
– A Mohr-Coulomb failure criterion for
a plane at the soil-rock interface, στ =
C + (σn - σp)tanφ, can be written
– For given soil density and angle of
internal friction, this gives the degree
of saturation (height of water table)
needed to make the slope unstable.
Some slopes are stable even when
saturated, some slopes are unstable
even when dry.
h
z
=
ρs
ρw
1 −
tanθ
tanφ
⎛
⎝
⎜
⎞
⎠
⎟
19. 19
Hillslope evolution: quantitative approach
• Failure model
– The failure criterion is coupled to a
hydrologic model based on Darcy flow
through the soil,
– This predicts the water level in the soil
needed to drain rainfall q; T is the
transmissivity (integrated permeability)
of the soil, a is the area uphill that drains
through an element of width b, and sinθ
gives the hydraulic head.
– Coupling the above two equations
predicts where the slopes will fail in
each rainstorm. Knowing rain statistics,
it predicts the overall evolution of a
landscape, since failure removes soil and
makes an open channel.
– The resulting rule for a/b is scale
independent, and is an example of a
system that will evolve a fractal
branching network of channels.
h
z
=
q
T
a
bsinθ
QuickTime™ and a
Video decompressor
are needed to see this picture.
20. 20
Feedbacks in geomorphology
• Feedback 1: Erosion is coupled to elevation, a negative
feedback
– High elevation promotes rapid erosion through freeze-thaw processes (a
rapid physical weathering mechanism), sparse vegetation (above the
treeline, roots do not stabilize slopes), increased precipitation (orographic
rainfall).
– There is also a general, though not perfect, correlation between high
elevation and high slope and relief, which promotes physical weathering
and sediment transport.
– Clearly erosion is one of the direct sources of changes in elevation, as well.
– Hence in the absence of tectonic uplift/subsidence, higher terrain will be
lowered fastest, tending to eliminate high slopes and large relief
differences.
21. 21
Feedbacks in geomorphology
• The idea that, in the absence of tectonic disturbance, the negative
feedback between elevation and erosion tends to eliminate relief is
the basis of W. M. Davis’ theory of landscape evolution:
22. 22
Feedbacks in geomorphology
• Feedback 2: Elevation and erosion are coupled to climate
– Topography affects weather patterns: e.g., rain shadow. More
profoundly, the uplift of the Himalaya-Tibet system caused the
onset of monsoonal circulation in south Asia.
– Climate affects erosion as well. This is clear in the case of
glacial episodes: when it gets cold enough, ice can become a
very effective agent of erosion and sediment dispersal. On the
other hand, warm temperatures promote faster chemical
weathering. Higher rainfall always increases both chemical and
physical weathering and erosion.
23. 23
Feedbacks in geomorphology
• Feedback 3: Erosion is coupled to uplift, a positive
feedback
– Because of isostasy, removal of mass from the top of the crust causes it to
rise. Loading of mass on top of the crust causes it to sink. Since isostasy
operates over some finite regional size (flexural wavelength ~100 km), it is
the average mass of crust on that scale that determines uplift. Hence
eroding of valleys can cause the intervening mountains to rise.
24. 24
Feedbacks in geomorphology
• Feedback 3
– There is evidence that this type of valley-incision denudation-
uplift is raising the high Himalaya:
25. 25
Global Synthesis of Erosion
• An example of a process geomorphology idea at the largest scale is
an attempt at the parameterization of global erosion rates
• Given area of a river catchment (km2
) and total sediment load of the river
(Mg/yr), mean sediment yield (Mg/km2
/yr) can be determined for the whole
drainage. Given density of sediment this is equivalent to mean vertical erosion
rate (knowing Mg/km3
, we get km/yr) for the whole drainage
26. 26
Global Synthesis of Erosion
• If we have some idea what the relevant variables are, we can
develop an empirical correlation from which the whole map of the
earth can be filled in from measurements of the major rivers and a
few tributaries.
• One such map is based on the correlation
where E is sediment yield (Mg/km2
/yr), p is rainfall of the rainiest
month (mm), P is mean annual rainfall (mm), H is mean elevation
of the catchment, and α is mean slope.
• This equation shows feedbacks 1 and 2
– E = f(H,α); Elevation -> Erosion -> Change in elevation
– E = f(p,P); Climate -> Erosion
• It also shows some additional relations:
– Episodic heavy rains have a larger effect the same total rain when steady
– Slope and elevation reinforce each other (E depends on their product)
logE = 2.65log(p
2
/ P) + 0.46 logH tanα −1.56
27. 27
Global Synthesis of Erosion
• Since we know slope, elevation, and rainfall statistics everywhere, and can work
our way up river drainages computing average sediment yield, the correlation of
the measured rivers is turned into a global map of sediment yield/erosion rate.
– What are the major features of the resulting map?
28. 28
Geomorphology and Tectonics
• For young tectonic activity, elevation and relief are
direct expressions of tectonic activity.
• For old stable terrains, elevation and relief become
expressions of relative rates of erosion.
– Thus, in California, anticlines are hills or mountains, but in
Pennsylvania, anticlines may just as well be valleys if the
older strata exposed in anticlinal cores are easily eroded.
• Ancient tectonic features must be recognized by the
relations of the rocks around them. Current tectonic
activity can be monitored by seismology and geodesy.
Everything in between depends on geomorphology.
– Geomorphic expression is by far the easiest way to locate
faults at the surface, and far more precise (at the surface) than
seismology.
29. 29
Geomorphology and Tectonics
• When the form of an original geomorphic feature is known, then
the magnitude of tectonic deformation can be determined by
measuring its current shape. Examples:
– fault scarps start from nothing, so height of scarp gives magnitude of total
dip-slip displacement.
– undisturbed drainages presumably go straight across faults; lateral offset
gives total strike-slip displacement.
– marine terraces start at sea-level, so height of wave-cut platform gives
total uplift since abandonment of terrace.
– river terraces start with longitudinal profile of riverbed; disturbances in
shape and slope give total deformation and tilt.
• When, furthermore, the age of the geomorphic feature is also
known, then the rate of tectonic deformation is determined as
well.
– How do you date geomorphology? This is a different problem from dating
rocks!
30. 30
Geomorphology and Tectonics
• Topographic profiles of uplifted
marine terraces at Santa Cruz, CA,
give two kinds of information:
• Total vertical uplift from height of wave-
cut platforms initially at sea level
• Relative deformation along shore from
shape of initial horizontal markers
• What additional type of data would be
useful here?
31. 31
Geomorphology and Tectonics
• Deformation of Ventura River terraces across syncline:
– A surprising result, since transverse ranges are in compression and full of thrust
faults, but you can’t have anticlines without synclines in between! So here there
is net uplift of terraces, but synclinal downwarping in the middle.
– No information on rates…this study was done in 1925 and terraces were not
datable by any technique known then.
– A more up-to-date example: terraces on Kali Gandaki river valley through
Himalayan front. These terraces can now be dated (but note the lowest one…).
32. 32
Measuring Geomorphic Rates
• We have several ways of measuring the rates of landscape
evolution.
– Dating of geomorphic surfaces: Much effort has been directed
towards measuring the age of erosional surfaces (peneplains,
terraces, etc.). using the exposure age of materials on that
surface.
• Thermoluminescence or electron spin resonance
• 14
C dating of organic matter in the soil
• Cosmogenic nuclides: 10
Be, 26
Al, 36
Cl
– Example: clocking development of normal fault scarp in limestone:
34. 34
Geomorphic Rates
• Measuring “uplift” rates:
– Instantaneous uplift can be measured directly by GPS or
geodetic surveying methods in some cases.
– Uplift over longer timescale is measured by
thermochronology: rocks cool as they move towards the
surface down a geothermal gradient. Various methods are
sensitive to the time since the rock cooled through specific
temperatures:
• Fission tracks anneal above ~240 °C. Knowing U and Th content,
counting of fission tracks gives a time since 240 °C. Knowing the
geothermal gradient converts this into a time since depth of ~6 km.
• He diffuses out of minerals quickly down to a closure temperature of
~75 °C. Knowing U and Th contents, Farley and co-workers have
developed the ability to clock the time since apatite crystals passed
through ~2 km depth.
• Does thermochronology actually measure uplift rates (with respect to
sea level) or erosion rates (motion of material points with respect to
the land surface)?