This document discusses rock weathering and its importance. It describes the key factors that control weathering, including lithology, climate, topography, and biological activity. Different types of weathering processes are outlined, such as physical heterogeneities, fractures, spheroidal weathering, regolith-induced weathering, and life-induced weathering. The dynamics of weathering vary between semi-arid and humid climates. Rock weathering is important for forming fertile farmland, controlling sediment geochemistry and water chemistry, and influencing the global carbon cycle through CO2 consumption.
Earth science and geology is the study of the Earth, including its composition, structure, physical properties, and history. Some key areas of focus include geology, the study of the age and structure of the Earth; geomorphology, the study of surface landforms and their evolution; and historical geology, the use of rocks and fossils to understand the past history of the Earth. The document also outlines various subdisciplines within geology like mineralogy, petrology, economic geology, and allied sciences like geochemistry, geophysics, and oceanography that involve applying other fields to geological problems and phenomena.
This document provides an overview of landslides and geohazards. It defines landslides and describes different types such as rotational, translational, and flows. Causes of landslides like earthquakes, heavy rainfall, slope geometry, and erosion are discussed. The document outlines approaches for landslide hazard mapping including qualitative, quantitative, and statistical methods. Finally, it presents methods for landslide remediation like increasing slope stability through drainage improvements, retaining walls, reinforcement, and vegetation.
Geology is the study of the physical structure and substance of the Earth. It provides knowledge about construction materials like stones and clay. It also helps understand natural geological processes like erosion that impact civil engineering projects. Geology is important for determining suitable foundations, exploring ground conditions via drilling, and planning major projects like dams, roads and tunnels. The study of geology includes physical geology, petrology, structural geology, and the weathering of rocks. Physical geology examines how the Earth's surface and interior change over time. Petrology studies the origin, composition and structure of different rock types. Structural geology analyzes the three-dimensional distribution of rocks and their deformation history. Weathering breaks down rocks through mechanical and chemical processes.
1. Geology is the science that studies the physical structure and composition of the Earth, as well as the processes that act on it.
2. Geology provides knowledge about construction materials like stones and clay that are important for civil engineering projects. It also helps understand natural geological processes like erosion that impact projects.
3. Geology is important for understanding groundwater resources and interpreting drilling data for projects like dams and bridges to ensure stable foundations.
Geology is the scientific study of the all constituents of planets, their internal and external forms and processes. More precisely, it is the study of nature, structure and history of the planet. Earth is the home to all life, well known to the humankind. Geology, itself, is a major part of The Earth and atmospheric sciences, which were born as twins . The subject of geology encompasses all aspects including the composition, structure, physical properties, and history of a planets'( like Earth's) inter-related components and the processes that are shaping the features on the surface. Geologists are the scientists who study the origin, occurrence, distribution and utilities of all materials(metallic, non-metallic, inorganic, etc), minerals, rocks, sediments, soils, water, oil and all other inorganic natural resources. It is a very vast subject covering a wide spectrum of scientific principles and holding hundred and fifty plus scientific branches. This report enumerates and highlights most of them, in a nutshell, for all those who intends to know for planning their career path.
Geology is the study of the Earth, including its composition, structure, physical properties, history and the processes that shape it. The document outlines several key branches of geology, including economic geology, mining geology, petroleum geology, engineering geology, environmental geology, geochemistry, geomorphology, geophysics, historical geology, hydrogeology, mineralogy, paleontology, petrology, structural geology, sedimentology, stratigraphy and volcanology. Each branch deals with different aspects of the Earth and geological processes. Engineering geology specifically applies geological knowledge to civil engineering projects regarding construction materials, site selection, and safe design and construction.
The document provides information on various topics in engineering geology including:
1. Definitions of engineering geology, geology, and their importance in civil engineering projects like understanding construction materials, groundwater, and foundations.
2. Branches of geology like physical geology, petrology, structural geology, and their focus on natural earth processes, rock origins and structures.
3. Key geological concepts like weathering, rock excavation methods, faults, folds, strike and dip, and seismic waves from earthquakes.
4. The importance of understanding local geology for planning major engineering works.
Earth science and geology is the study of the Earth, including its composition, structure, physical properties, and history. Some key areas of focus include geology, the study of the age and structure of the Earth; geomorphology, the study of surface landforms and their evolution; and historical geology, the use of rocks and fossils to understand the past history of the Earth. The document also outlines various subdisciplines within geology like mineralogy, petrology, economic geology, and allied sciences like geochemistry, geophysics, and oceanography that involve applying other fields to geological problems and phenomena.
This document provides an overview of landslides and geohazards. It defines landslides and describes different types such as rotational, translational, and flows. Causes of landslides like earthquakes, heavy rainfall, slope geometry, and erosion are discussed. The document outlines approaches for landslide hazard mapping including qualitative, quantitative, and statistical methods. Finally, it presents methods for landslide remediation like increasing slope stability through drainage improvements, retaining walls, reinforcement, and vegetation.
Geology is the study of the physical structure and substance of the Earth. It provides knowledge about construction materials like stones and clay. It also helps understand natural geological processes like erosion that impact civil engineering projects. Geology is important for determining suitable foundations, exploring ground conditions via drilling, and planning major projects like dams, roads and tunnels. The study of geology includes physical geology, petrology, structural geology, and the weathering of rocks. Physical geology examines how the Earth's surface and interior change over time. Petrology studies the origin, composition and structure of different rock types. Structural geology analyzes the three-dimensional distribution of rocks and their deformation history. Weathering breaks down rocks through mechanical and chemical processes.
1. Geology is the science that studies the physical structure and composition of the Earth, as well as the processes that act on it.
2. Geology provides knowledge about construction materials like stones and clay that are important for civil engineering projects. It also helps understand natural geological processes like erosion that impact projects.
3. Geology is important for understanding groundwater resources and interpreting drilling data for projects like dams and bridges to ensure stable foundations.
Geology is the scientific study of the all constituents of planets, their internal and external forms and processes. More precisely, it is the study of nature, structure and history of the planet. Earth is the home to all life, well known to the humankind. Geology, itself, is a major part of The Earth and atmospheric sciences, which were born as twins . The subject of geology encompasses all aspects including the composition, structure, physical properties, and history of a planets'( like Earth's) inter-related components and the processes that are shaping the features on the surface. Geologists are the scientists who study the origin, occurrence, distribution and utilities of all materials(metallic, non-metallic, inorganic, etc), minerals, rocks, sediments, soils, water, oil and all other inorganic natural resources. It is a very vast subject covering a wide spectrum of scientific principles and holding hundred and fifty plus scientific branches. This report enumerates and highlights most of them, in a nutshell, for all those who intends to know for planning their career path.
Geology is the study of the Earth, including its composition, structure, physical properties, history and the processes that shape it. The document outlines several key branches of geology, including economic geology, mining geology, petroleum geology, engineering geology, environmental geology, geochemistry, geomorphology, geophysics, historical geology, hydrogeology, mineralogy, paleontology, petrology, structural geology, sedimentology, stratigraphy and volcanology. Each branch deals with different aspects of the Earth and geological processes. Engineering geology specifically applies geological knowledge to civil engineering projects regarding construction materials, site selection, and safe design and construction.
The document provides information on various topics in engineering geology including:
1. Definitions of engineering geology, geology, and their importance in civil engineering projects like understanding construction materials, groundwater, and foundations.
2. Branches of geology like physical geology, petrology, structural geology, and their focus on natural earth processes, rock origins and structures.
3. Key geological concepts like weathering, rock excavation methods, faults, folds, strike and dip, and seismic waves from earthquakes.
4. The importance of understanding local geology for planning major engineering works.
The document discusses key topics in engineering geology including:
1) The importance of geology to civil engineering as all civil engineering works involve earth and its features.
2) The physical properties of minerals that are important for identifying and classifying different rock types.
3) The three main types of rocks - igneous, sedimentary, and metamorphic - and their origins and characteristic properties.
4) Important geological structures like strike, dip, folds, faults, joints and unconformities that influence civil engineering design and construction.
This document provides an overview of engineering geology and its scope. It discusses how geology relates to civil engineering projects in areas like construction, water resource development, and town planning. Key points covered include:
- Engineering geology deals with applying geology principles to safe and economic design of civil engineering projects.
- Geological maps, hydrological maps, and topographical maps are important for planning projects.
- Geological characteristics like bedrock, mechanical properties, and seismic activity influence project design.
- Geological knowledge aids in quality control of construction materials and sensitive construction areas.
- Geology is relevant for water resource exploration, development, and the water cycle understanding.
- Land utilization and regional planning requires considering natural geological features and
The document discusses geology and soil mechanics for civil engineering. It covers the dynamic nature of the Earth and concepts like plate tectonics and the rock cycle. It also discusses different rock types, including igneous, metamorphic and sedimentary rocks. Additionally, it emphasizes the importance for civil engineers to understand properties of rock and soil like porosity, permeability and strength, and to account for erosional and geological changes over time, as unstable ground can lead to foundation problems. It also briefly mentions inadequate investigation and unstable ground as potential geotechnical issues.
Geography form 1 notes, kenya syllabusHamadySagiru
Geography is the study of the Earth. There are two main branches: physical geography, which examines landforms and climate, and human geography, which studies human activities and settlements. Geography relates to other subjects like chemistry, physics, agriculture, biology and history.
The solar system consists of the Sun and objects that orbit it, like planets, asteroids, comets and moons. The Earth originated from a cloud of gas and dust about 4.6 billion years ago. It rotates on its axis and revolves around the Sun, causing day/night and seasons. Internally, it has a core, mantle and crust. Geography involves understanding our planet and its relationship to other celestial bodies.
1) The document discusses the importance of geology in civil engineering projects. Geology provides information about site selection, construction materials, and foundation stability that is vital for planning, designing, and building structures.
2) Failures of civil engineering projects like dams can sometimes be attributed to geological factors that were not properly considered, such as weak foundations or faults. A thorough understanding of geology can help prevent these types of failures.
3) Key areas of geology discussed include petrology, structural geology, mineralogy, and their significance for civil engineering. Understanding the composition and properties of rocks, minerals, and geological structures aids in engineering design and construction.
The presentation contains basic terms of Physical Geology which is related to Geology. It is a gross presentation including images and animated gif's for better understanding.
This document provides an introduction to geology and its importance from a civil engineering perspective. It discusses the definitions and branches of geology, including mineralogy, petrology, geophysics, stratigraphy, physical geology, hydrogeology, and structural geology. The branches study minerals, rocks, the structure and evolution of the Earth, rock layers and ages, geological processes and landforms, groundwater, and rock structures. The document emphasizes the importance of geology for civil engineers for site selection, understanding construction materials and ground conditions, planning projects, and treating geological features like faults or joints that could impact stability. A foundation in the introduction to geology and key branches is important for civil engineers.
Engineering geology involves applying geological principles to engineering projects. It requires studying the geology of an area to ensure geological factors will not negatively impact projects. The document outlines the basic knowledge required for engineering geology, which includes understanding rock and soil types, their properties, and how they are influenced by geologic processes and structures. It also discusses various methods used in geological investigations and their applications to engineering projects.
This is a presentation onEngineering Geology.
It contains-
>>Meaning
>>Definition
>>Objective
>>Scope in Construction;Water Resource Developement;Town and Regional Planning.
>>Age Of Earth.
---------------------------------------------------------------------------------------------------------------------------
Geology is the study of the Earth, including its composition, structure, physical properties, history, and the processes that shape it. Some key branches of geology include historical geology, which studies the evolution of life and organic development by examining rock sequences and fossils. Paleontology specifically focuses on the preservation and utilization of plant and animal remains for understanding the past history of Earth. Environmental geology applies geological principles to problems caused by human occupation and exploitation of the environment.
1.1 introduction of geology,Branches and Scope of GeologyRam Kumawat
This document discusses the branches and scope of geology. It outlines 15 branches of geology including physical geology, crystallography, mineralogy, petrology, structural geology, stratigraphy, paleontology, historical geology, economic geology, mining geology, civil engineering geology, hydrology, Indian geology, resources engineering, and photo geology. It then discusses the importance and scope of geology for civil engineering, including providing construction materials knowledge, helping with erosion and deposition projects, tunneling and foundations, and reducing engineering costs.
The document provides an overview of general geology topics including the structure of Earth, reasons for studying geology, a view of Earth's spheres, and details about the International Space Station (ISS). It describes Earth's core, mantle and crust. It explains why geology is studied to understand hazards, resources, and the environment. It outlines the hydrosphere, atmosphere, biosphere and solid Earth. It then provides details about the construction, modules, and power supply of the ISS, which is an international research facility assembled in low Earth orbit.
This document provides an overview of engineering geology and its relevance to civil engineering. It defines engineering geology as the application of geology to ensure safe, stable and economical design and construction of civil engineering projects. The document outlines how different branches of geology, such as physical geology, mineralogy, petrology, structural geology and hydrogeology inform various aspects of civil engineering including construction, water resource development, and town planning by providing information on site conditions, material properties, and subsurface exploration. Key geological factors that influence civil engineering activities like dams, bridges and tunnels are also summarized.
This document provides an overview of the different branches of geology. It discusses the definition of geology as the study of the Earth, including its origin, structure, composition and history. Some of the key branches mentioned include physical geology, mineralogy, crystallography, petrology, structural geology, geophysics, stratigraphy, geochemistry, paleontology, historical geology, economic geology, mining geology, hydrogeology, geology of Pakistan, resources engineering, photo geology, remote sensing, engineering geology, and field geology. Each branch is studied to better understand different aspects of the Earth and its materials.
Geology is the study of the Earth, including its origin, structure, composition and processes that have shaped it over time. It involves studying the Earth through observation, analysis and synthesis at locations like libraries, laboratories, museums and field sites. Geology is related to other sciences and has many branches of study. It is important to study geology because geological processes and resources influence human civilization, environments and hazards, and geology underpins engineering and understanding of landforms and Earth's history.
Geology is the study of the Earth, including its composition, structure, physical properties, history and the processes that shape it. It involves studying topics like the origin and age of the Earth, its internal structure, various surface features and how they evolve and change over time. Geology has many branches that study different aspects like physical geology, geomorphology, mineralogy, petrology, economic geology, geochemistry, geophysics, hydrogeology, mining geology, engineering geology and more. Civil engineers and geologists work closely together in areas like planning, designing and constructing major civil engineering projects to ensure their safety, stability and cost-effectiveness by understanding the geological conditions and properties of the construction site and materials.
This document provides an overview of soil mechanics. It defines soil and discusses its solid, liquid, and gaseous phases. Soil can be residual, formed from weathered parent rock, or transported by agents like water, wind, or glaciers. The document also examines soil classification and composition, discussing factors like particle size, mineralogy, voids, and cementation that influence soil behavior.
This document summarizes key aspects of soil formation processes. It discusses how the variety of materials encountered by geotechnical engineers ranges from hard rock to soft organic deposits. Soil identification and evaluation of properties is important for analysis and design. The document then provides an overview of processes involved in soil formation, including weathering of rock, erosion, transportation, deposition, and post-depositional changes. It discusses the composition and structure of the earth's crust and continental plates. Rocks and minerals are broken down through these natural processes over geological time to form the variety of soil types.
This document discusses soil, including its composition, formation processes, and classification. Soil forms through weathering of parent materials and is influenced by climate, topography, biological factors, and time. Key processes in soil formation include leaching, eluviation, illuviation, podsolisation, and gleying. Soil taxonomy classifies soils into orders, suborders, great groups, and subgroups based on properties related to formation factors. Soil provides the medium for plant growth and is a natural resource consisting of minerals, water, air, organic matter, and living organisms.
Weathering is an important geological mechanism which can destabilize the earth’s surface materials and remove them by erosive processes. Weathering is the physical disintegration and chemical decomposition of a rock mass on the land. It is a unique phenomena happening on the earth’ surface. Weathering is a collective term used to denote the mechanical, chemical and biological(organic) processes that take place on the earth’s surface. Weathering of rock-forming minerals can create new products from pre-existing rocks. In many regions, soils are the ultimate products of weathering. Weathering of rocks releases chemical compounds that become available for biological processes. It is necessary to study the factors that are influencing the weathering processes.
This document provides an overview of geotechnical engineering and soil mechanics. It discusses the formation of soils through weathering and transportation processes. Soils are formed from the breakdown of parent rocks by physical and chemical weathering. They are then transported and deposited in new locations by various agents such as water, wind, ice and gravity. The document outlines different types of soils including residual soils formed in place and transported soils deposited elsewhere. It provides details on soil classification systems and properties relevant to geotechnical engineering applications.
This document provides an overview of geotechnical engineering and soil mechanics concepts across 5 lectures. It discusses the origin and formation of soils, soil classification systems, phase relationships in soils, permeability, consolidation, shear strength, and soil stabilization techniques. Key topics covered include soil composition, index properties, stress conditions in soil, seepage analysis, compaction, shear strength determination methods, and mechanical and chemical stabilization methods. Real-world engineering applications of soil mechanics are also mentioned.
The document discusses key topics in engineering geology including:
1) The importance of geology to civil engineering as all civil engineering works involve earth and its features.
2) The physical properties of minerals that are important for identifying and classifying different rock types.
3) The three main types of rocks - igneous, sedimentary, and metamorphic - and their origins and characteristic properties.
4) Important geological structures like strike, dip, folds, faults, joints and unconformities that influence civil engineering design and construction.
This document provides an overview of engineering geology and its scope. It discusses how geology relates to civil engineering projects in areas like construction, water resource development, and town planning. Key points covered include:
- Engineering geology deals with applying geology principles to safe and economic design of civil engineering projects.
- Geological maps, hydrological maps, and topographical maps are important for planning projects.
- Geological characteristics like bedrock, mechanical properties, and seismic activity influence project design.
- Geological knowledge aids in quality control of construction materials and sensitive construction areas.
- Geology is relevant for water resource exploration, development, and the water cycle understanding.
- Land utilization and regional planning requires considering natural geological features and
The document discusses geology and soil mechanics for civil engineering. It covers the dynamic nature of the Earth and concepts like plate tectonics and the rock cycle. It also discusses different rock types, including igneous, metamorphic and sedimentary rocks. Additionally, it emphasizes the importance for civil engineers to understand properties of rock and soil like porosity, permeability and strength, and to account for erosional and geological changes over time, as unstable ground can lead to foundation problems. It also briefly mentions inadequate investigation and unstable ground as potential geotechnical issues.
Geography form 1 notes, kenya syllabusHamadySagiru
Geography is the study of the Earth. There are two main branches: physical geography, which examines landforms and climate, and human geography, which studies human activities and settlements. Geography relates to other subjects like chemistry, physics, agriculture, biology and history.
The solar system consists of the Sun and objects that orbit it, like planets, asteroids, comets and moons. The Earth originated from a cloud of gas and dust about 4.6 billion years ago. It rotates on its axis and revolves around the Sun, causing day/night and seasons. Internally, it has a core, mantle and crust. Geography involves understanding our planet and its relationship to other celestial bodies.
1) The document discusses the importance of geology in civil engineering projects. Geology provides information about site selection, construction materials, and foundation stability that is vital for planning, designing, and building structures.
2) Failures of civil engineering projects like dams can sometimes be attributed to geological factors that were not properly considered, such as weak foundations or faults. A thorough understanding of geology can help prevent these types of failures.
3) Key areas of geology discussed include petrology, structural geology, mineralogy, and their significance for civil engineering. Understanding the composition and properties of rocks, minerals, and geological structures aids in engineering design and construction.
The presentation contains basic terms of Physical Geology which is related to Geology. It is a gross presentation including images and animated gif's for better understanding.
This document provides an introduction to geology and its importance from a civil engineering perspective. It discusses the definitions and branches of geology, including mineralogy, petrology, geophysics, stratigraphy, physical geology, hydrogeology, and structural geology. The branches study minerals, rocks, the structure and evolution of the Earth, rock layers and ages, geological processes and landforms, groundwater, and rock structures. The document emphasizes the importance of geology for civil engineers for site selection, understanding construction materials and ground conditions, planning projects, and treating geological features like faults or joints that could impact stability. A foundation in the introduction to geology and key branches is important for civil engineers.
Engineering geology involves applying geological principles to engineering projects. It requires studying the geology of an area to ensure geological factors will not negatively impact projects. The document outlines the basic knowledge required for engineering geology, which includes understanding rock and soil types, their properties, and how they are influenced by geologic processes and structures. It also discusses various methods used in geological investigations and their applications to engineering projects.
This is a presentation onEngineering Geology.
It contains-
>>Meaning
>>Definition
>>Objective
>>Scope in Construction;Water Resource Developement;Town and Regional Planning.
>>Age Of Earth.
---------------------------------------------------------------------------------------------------------------------------
Geology is the study of the Earth, including its composition, structure, physical properties, history, and the processes that shape it. Some key branches of geology include historical geology, which studies the evolution of life and organic development by examining rock sequences and fossils. Paleontology specifically focuses on the preservation and utilization of plant and animal remains for understanding the past history of Earth. Environmental geology applies geological principles to problems caused by human occupation and exploitation of the environment.
1.1 introduction of geology,Branches and Scope of GeologyRam Kumawat
This document discusses the branches and scope of geology. It outlines 15 branches of geology including physical geology, crystallography, mineralogy, petrology, structural geology, stratigraphy, paleontology, historical geology, economic geology, mining geology, civil engineering geology, hydrology, Indian geology, resources engineering, and photo geology. It then discusses the importance and scope of geology for civil engineering, including providing construction materials knowledge, helping with erosion and deposition projects, tunneling and foundations, and reducing engineering costs.
The document provides an overview of general geology topics including the structure of Earth, reasons for studying geology, a view of Earth's spheres, and details about the International Space Station (ISS). It describes Earth's core, mantle and crust. It explains why geology is studied to understand hazards, resources, and the environment. It outlines the hydrosphere, atmosphere, biosphere and solid Earth. It then provides details about the construction, modules, and power supply of the ISS, which is an international research facility assembled in low Earth orbit.
This document provides an overview of engineering geology and its relevance to civil engineering. It defines engineering geology as the application of geology to ensure safe, stable and economical design and construction of civil engineering projects. The document outlines how different branches of geology, such as physical geology, mineralogy, petrology, structural geology and hydrogeology inform various aspects of civil engineering including construction, water resource development, and town planning by providing information on site conditions, material properties, and subsurface exploration. Key geological factors that influence civil engineering activities like dams, bridges and tunnels are also summarized.
This document provides an overview of the different branches of geology. It discusses the definition of geology as the study of the Earth, including its origin, structure, composition and history. Some of the key branches mentioned include physical geology, mineralogy, crystallography, petrology, structural geology, geophysics, stratigraphy, geochemistry, paleontology, historical geology, economic geology, mining geology, hydrogeology, geology of Pakistan, resources engineering, photo geology, remote sensing, engineering geology, and field geology. Each branch is studied to better understand different aspects of the Earth and its materials.
Geology is the study of the Earth, including its origin, structure, composition and processes that have shaped it over time. It involves studying the Earth through observation, analysis and synthesis at locations like libraries, laboratories, museums and field sites. Geology is related to other sciences and has many branches of study. It is important to study geology because geological processes and resources influence human civilization, environments and hazards, and geology underpins engineering and understanding of landforms and Earth's history.
Geology is the study of the Earth, including its composition, structure, physical properties, history and the processes that shape it. It involves studying topics like the origin and age of the Earth, its internal structure, various surface features and how they evolve and change over time. Geology has many branches that study different aspects like physical geology, geomorphology, mineralogy, petrology, economic geology, geochemistry, geophysics, hydrogeology, mining geology, engineering geology and more. Civil engineers and geologists work closely together in areas like planning, designing and constructing major civil engineering projects to ensure their safety, stability and cost-effectiveness by understanding the geological conditions and properties of the construction site and materials.
This document provides an overview of soil mechanics. It defines soil and discusses its solid, liquid, and gaseous phases. Soil can be residual, formed from weathered parent rock, or transported by agents like water, wind, or glaciers. The document also examines soil classification and composition, discussing factors like particle size, mineralogy, voids, and cementation that influence soil behavior.
This document summarizes key aspects of soil formation processes. It discusses how the variety of materials encountered by geotechnical engineers ranges from hard rock to soft organic deposits. Soil identification and evaluation of properties is important for analysis and design. The document then provides an overview of processes involved in soil formation, including weathering of rock, erosion, transportation, deposition, and post-depositional changes. It discusses the composition and structure of the earth's crust and continental plates. Rocks and minerals are broken down through these natural processes over geological time to form the variety of soil types.
This document discusses soil, including its composition, formation processes, and classification. Soil forms through weathering of parent materials and is influenced by climate, topography, biological factors, and time. Key processes in soil formation include leaching, eluviation, illuviation, podsolisation, and gleying. Soil taxonomy classifies soils into orders, suborders, great groups, and subgroups based on properties related to formation factors. Soil provides the medium for plant growth and is a natural resource consisting of minerals, water, air, organic matter, and living organisms.
Weathering is an important geological mechanism which can destabilize the earth’s surface materials and remove them by erosive processes. Weathering is the physical disintegration and chemical decomposition of a rock mass on the land. It is a unique phenomena happening on the earth’ surface. Weathering is a collective term used to denote the mechanical, chemical and biological(organic) processes that take place on the earth’s surface. Weathering of rock-forming minerals can create new products from pre-existing rocks. In many regions, soils are the ultimate products of weathering. Weathering of rocks releases chemical compounds that become available for biological processes. It is necessary to study the factors that are influencing the weathering processes.
This document provides an overview of geotechnical engineering and soil mechanics. It discusses the formation of soils through weathering and transportation processes. Soils are formed from the breakdown of parent rocks by physical and chemical weathering. They are then transported and deposited in new locations by various agents such as water, wind, ice and gravity. The document outlines different types of soils including residual soils formed in place and transported soils deposited elsewhere. It provides details on soil classification systems and properties relevant to geotechnical engineering applications.
This document provides an overview of geotechnical engineering and soil mechanics concepts across 5 lectures. It discusses the origin and formation of soils, soil classification systems, phase relationships in soils, permeability, consolidation, shear strength, and soil stabilization techniques. Key topics covered include soil composition, index properties, stress conditions in soil, seepage analysis, compaction, shear strength determination methods, and mechanical and chemical stabilization methods. Real-world engineering applications of soil mechanics are also mentioned.
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
**needs updates and improvements
these slide is made with excerpts from other published and unpublished books,journals, studies and om-line references.No Plagiarism was intended.
Made for April-May 2015 Agriculture Major Admission test Review. Cavite State University.
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 provides an overview of geology and its importance in civil engineering. It discusses key topics in geology including mineralogy, petrology, structural geology, physical geology, and geomorphology. Geology is important for civil engineering projects as it provides information on construction materials, foundation stability, and terrain. A basic understanding of earth materials like minerals, rocks, and soils is essential for tasks like tunneling, hydroelectric projects, and evaluating slope stability.
Chemical weathering is the breakdown of rocks and minerals through chemical reactions with the environment, such as water, air, and organisms. It is influenced by many factors like temperature, climate, surface area exposure, and the presence of water and plants. Chemical weathering breaks down rocks into smaller particles, forms new minerals, and alters chemical compositions through processes like hydrolysis, oxidation, and ion exchange. It shapes landscapes over thousands of years and influences soil and water resources.
Chemostratigraphy is the study of chemical variations in rock sequences based on elemental or isotopic composition. It provides a useful tool for unconventional resource exploration. Some chemical signatures in rocks, like stable isotopes, can be used as accurate stratigraphic markers because they record global environmental changes over thousands of years. Common tools in chemostratigraphy include oxygen, carbon, and strontium isotope analysis, with strontium isotopes widely used for correlation due to long ocean residence times allowing identification of major shifts in the isotopic curve.
The document discusses three types of evolution: geologic, biologic, and technologic. It focuses on geologic evolution, explaining how rocks, fossils, and ice cores provide evidence of changes to the Earth's surface and climate over time, as well as changes to life forms. The law of superposition and use of index fossils allow scientists to determine the relative ages of rock layers. Studying this geologic evidence has helped scientists develop an understanding of how the Earth and life have evolved over millions of years.
This document discusses weathering, which is the process of decay and disintegration of rocks due to physical and chemical agents in the atmosphere like wind, water, ice and sun. It defines various terminology related to weathering like disintegration, deposition, decomposition, erosion and deflation. The types of weathering are mechanical, chemical and biological. Mechanical weathering breaks rocks into pieces through forces like wind, rivers, glaciers etc without chemical change. Chemical weathering breaks rocks through chemical processes like oxidation and carbonation. Biological weathering occurs through processes involving trees, plants, animals and human activity. Factors like the rock type, climate, topography and burrowing organisms affect the rate of weathering. Weathering produces el
The lithosphere is the solid shell of the planet Earth. That means the crust, plus the part of the upper mantle that behaves elastically on long timescales.
1. Engineering geology is the application of geology for safe and economic design of engineering projects. It helps identify geologic hazards and suitable construction materials.
2. Physical weathering breaks rocks into smaller pieces through mechanical processes like frost cracking, exfoliation, and roots growing without chemical changes to the rock.
3. Chemical weathering alters the mineralogical and chemical composition of rocks through hydrolysis, oxidation, and carbonation reactions with water, oxygen, and carbon dioxide. This breaks rocks down into soils.
Weathering, Soil Formation and Development
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The earths engine tectonics, weathering and erosion (2)
1. Dr.PANKAJ MEHTA
Assistant Professor
Department of Environmental Sciences
Central University of Jammu, Jammu.
Email:drpankajmehta79@gmail.com
THE EARTH’S ENGINE
TECTONICS, WEATHERING AND EROSION
2. FRAMEWORK
INTRODUCTIONINTRODUCTION
WEATHERING AND GLOBAL CLIMATEWEATHERING AND GLOBAL CLIMATE
WEATHERING AND MOBILIZATION OF ELEMENTSWEATHERING AND MOBILIZATION OF ELEMENTS
DYNAMIC WEATHERING:
HOW DOES ROCK WEATHERING PROCEED IN NATURE?
SUMMARY
3. • Acts on Non-living system “rocks” to make a life supporting system-
“soil”.
• Involves Rocks, water, air, soil, & life.
• Controlling factors:
– Structure & texture of the rocks.
– Tectonics : climate, relief and vegetation.
Importance of Rock Weathering
• Rock Weathering is the basis of formation of farmland in flood plain
and delta
• Rock Weathering Controls:
– Water Chemistry
– Chemistry of soil and sediments
– Soil Fertility and Maintanance
– Geochemical cycling of elements
– Climate ( Weathering of rock forming silicates esp. Ca-Mg bearing
ones, is an important sink for atmospheric CO2.)
Weathering
4.
5. Rock Weathering : Important Aspects
Rock Weathering studies gaining importance
1. In context of increased soil erosion and climate change.
2. For better management of the landscape / environment.
3. To understand weathering process in monsoonal
climate regions, e.g. India, with shorter spell of rains and
longer spell of semi-aridity
6. Factors Controlling Weathering
•Lithology - Lithology exerts a major control on weathering rate (Bluth and Kump,
1991; Bluth and Kump, 1994) by influencing the availability of minerals with varying
reactivity. Texture influences permeability and therefore the degree of infiltration of
rainwater into the rock.
•Climate- Moisture and heat promote chemical reactions. In cold climates, chemical
weathering proceeds very slowly. In such regions the effects of mechanical weathering are
generally more obvious. Many studies have found that rates of chemical weathering are
directly correlated to temperature (Drever and Zobrist, 1992; Velbel, 1993; Brady and
Carroll, 1994) and precipitation or runoff (Dunne, 1978; White and Blum, 1995)
•Topography-. It exerts this influence in several ways, by controlling (a) the rate of
surface runoff of rain water and hence the rate of moisture intake by the parent rock, (b) the
rate of subsurface drainage and therefore the rate of leaching of the soluble constituents,
and(c) the rate of erosion of the weathered products and thereby the rate of exposure of fresh
mineral surfaces
7. Biological activity and Vegetation:
•Recently it has been realized that biological activities play an important role in weathering
processes (White and Brantley, 1995; Neaman et al., 2005). Similarly, in reactions at bio-
mineral interfaces, release of organic acids causes enhanced mineral dissolution by forming
complexes with minerals at the surface (Stumm et al., 1984; Krishanswami and Singh,
2005). The mechanism of bio-reactions make soil formation a positive feedback process
(Soil is needed to form more soil)
•Vegetation cover can affect silicate rock weathering rates by increasing soil CO2 content,
stabilizing soil cover and producing organic acids (Keeney, 1983; Heyes and Moore, 1992;
Drever, 1994; Caldeira, 2005)
9. WEATHERING AND GLOBAL CLIMATE
Silicate weathering in particular is thought to control global climate over long time
scales through the consumption of atmospheric CO2 that is initially stored as soil
carbon and eventually stored as carbonates in the oceans (Walker et al.,1981) This
process is governed by the rate of carbonic acid dissolution reactions, as originally
proposed by (Ebelmen,1845).
2CO2 +3H2O+ CaAl2Si2O8 = Ca+2 + 2 HCO3- +Al2 Si2 O5(OH4)
The temperature- dependence of this reaction on Earth surface settings is thought to
provide the feedback that regulates climate over geological time (Walker et al., 1981;
Berner et al., 1983) and maintains equable climate conditions on Earth (J.Kasting, 1987;
Krishanswami and Singh, 2005).
The surface area of continental basalts plays a major role in the carbon cycle
(Dessert et al., 2003) It is important to note that the estimate of 4.08 X 1012
mol/year
of CO2 consumed by weathering of basalts was determined from the present-day
basalt surface area (Dessert et al., 2003).
11. WEATHERING AND MOBILIZATION OF ELEMENTS
Mineralogy is the predominant factor controlling the mobility of major elements (Harris
and Adams, 1966) whereas trace element mobilization and redistribution during
weathering are controlled by dissolution of primary minerals, formation of secondary
phases, transport of materials, redox processes, co-precipitation and ion exchange of
various minerals (; Nesbitt, 1979; Nesbitt et al.,1980; Fritz and Regland, 1980; Chesworth
et al,1981; Cramer and Nesbitt, 1983; Fritz and Mohr, 1984; Middleberg et al, 1988;
Condie et al, 1995;) The retention of trace elements in the weathering profile depends on
the formation and stability of secondary minerals
During rock weathering, elements can be either mobile or immobile. Mobile
elements like Ca, Na, K, Sr, Mg and Si are derived mainly from leachable
minerals such as feldspar, ferromagnesian minerals and apatite, whereas immobile
elements like, Zr, Hf, Fe, Al, Th, Nb, and REE are either concentrated in resistant
phases or strongly adsorbed by secondary minerals (gibbsite, kaolinite)
(Middleberg et al, 1988)
13. Rocks weather to produce soils which become sediments after erosion, transport and
deposition. It is well known that tectonics and denudational processes continuously shape
the Earth’s surface (Ledley et al, 1999) However, our knowledge of the associated
processes is inadequate. The rate and nature of weathering vary widely and are controlled
by many variables such as parent rock-type, topography, climate and biological activities.
It involves interaction between the lithosphere, hydrosphere, atmosphere and biosphere.
Weathering profoundly alters the surface of the earth and the chemistry of water bodies.
We document here five different ways of water entry into the rocks and weathering of
hard rocks in the field and these are:
•Physical heterogeneities present in the rocks and these include –
•(a) foliation planes (b) lithological contacts (c) compositional layers (d) joints &
fractures (e) shear zones.
•Secondary fractures developed during uplift and unroofing – Fracture induced
weathering.
•Spheroidal Weathering.
•Regolith Induced Weathering – Regolith accumulating on slopes and foothills.
•Life Induced Weathering – Through plant root system, animals etc
DYNAMIC WEATHERINGDYNAMIC WEATHERING
14. Field documentation of weatheringField documentation of weathering
processprocess
Physical heterogeneities present in the rocks and these includePhysical heterogeneities present in the rocks and these include
(a) foliation planes (b) lithological contacts (c) compositional(a) foliation planes (b) lithological contacts (c) compositional
layers (d) joints & fractures (e) shear zones.layers (d) joints & fractures (e) shear zones.
Secondary fractures developed during uplift and unroofing –Secondary fractures developed during uplift and unroofing –
Fracture induced weathering.Fracture induced weathering.
Spheroidal Weathering.Spheroidal Weathering.
Regolith Induced Weathering – Regolith accumulating onRegolith Induced Weathering – Regolith accumulating on
slopes and foothills.slopes and foothills.
Life Induced Weathering – Through plant root system, animalsLife Induced Weathering – Through plant root system, animals
etcetc
15. Field photographs showing physical heterogeneities inherent inField photographs showing physical heterogeneities inherent in
the rock (structural induced weathering)the rock (structural induced weathering)
16. Field photographs showing fracture induced weatheringField photographs showing fracture induced weathering
in the rock.in the rock.
17. Field photographs showing spheroidal weathering in the rock.Field photographs showing spheroidal weathering in the rock.
18. Field photographs showing regolith induced weathering in the rock.Field photographs showing regolith induced weathering in the rock.
19. Field photographs showing life induced weathering in the rock.Field photographs showing life induced weathering in the rock.
20. DYNAMICS OF WEATHERING
In semi-arid climatic set-up. Physical heterogeneities andIn semi-arid climatic set-up. Physical heterogeneities and
fracture induced are the major weathering processesfracture induced are the major weathering processes
In the humid climatic set-up. Regolith-induced and life-inducedIn the humid climatic set-up. Regolith-induced and life-induced
are the major processes undergone by rocks to weather.are the major processes undergone by rocks to weather.
The process of spheroidal weathering is common in both semi-The process of spheroidal weathering is common in both semi-
arid as well as humid climatic set-uparid as well as humid climatic set-up
The processes of rock weathering are in continuous motion atThe processes of rock weathering are in continuous motion at
different levels with different climatic condition and withdifferent levels with different climatic condition and with
different set of processes enlisted above, thus the process ofdifferent set of processes enlisted above, thus the process of
Weathering is not static rather it is Dynamic in natureWeathering is not static rather it is Dynamic in nature
21. IMPORTANCE OF WEATHERING IN FARMLAND, SEDIMENT
GEOCHEMISTRY AND WATER CHEMISTRY
•A region subjected to uplift experiences a high rate of erosion because of several
geological, climatic and biological factors. It is well known that soil formation is a
positive feedback process, where the product of the process accelerates the product
formation by the process.
•The chemical weathering under the semi-arid condition and limited water
availability but under the influence of structural heterogeneities produces
less weathered materials and the erosion of less weathered materials forms
the fertile farmlands in the downstream floodplains.
•Extensive weathering under humid climatic setup cannot supply the
nutrient rich sediment, however nutrients in the solute forms are delivered
to the river and then to the sea controlling the water chemistry also.
•The extensive chemical weathering taking place in humid climatic setup
is responsible for controlling the marine productivity by transporting
nutrients in water.
SUMMARY
22. •Berner, R. A., Lasaga, A. C. and Garrels, R. M. (1983) The carbonate-silicate geochemical cycle
and its effect on atmospheric carbon-di-oxide over the past 100 millions years. Amer. Jour. Sci.
283, pp.641-683.
•Caldiera, K. (2006) Forests, climate and silicate rock weathering, Journal of Geochemical
Exploration, V. 88, pp. 419-422.
•Chesworth, W., Dejou, J. and Larroque, P. (1981) The weathering of basalts and relative
mobilities of the major elements at Belbex, France. Geochim. Cosmochim. Acta, 45, pp.1235-
1243.
•Condie, K. C., Dengate, J. and Cullers, R. L (1995) Behaviour of rare earth elements in a
palaeoweathering profile on granodiorite in the Front Range, Colorado, U.S.A., Geochim.
Cosmochim. Acta, 59, pp.279-274.
•Cramer. J. J. and Nesbitt, H. W. (1983) Mass-balance relations and trace element mobility during
continental weathering of various igneous rocks. Symp.on Petrology of Weathering and Soils. Sci.
Geol., Mem., 73, pp.63-73.
•Dessert, C., Dupre, B., Gaillardet, J., Francois, L. M. and Allegre, C. J. (2003) Basalt weathering
laws and the impact of basalt weathering on the global carbon cycle, Chem. Geol. 202, pp. 257-
273.
•Drever, J. I. (1994) Effect of plants on chemical weathering rates. Geochim. Cosmochim.Acta 58.
pp. 2325-2332.
•Ebelmen, J. (1845) Sur les produits de la decomposition des especes minerales de famille des
silicates, Ann. Mines, 7, pp. 3-66.
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23. •Keeney, D. R. (1983) Principles of microbial processes of chemical degradation, accumulation and
assimilation, Chemical mobility and reactivity in soil systems, Madison, pp. 153-164.
•Krishnaswami, S. and Singh, S. K. (2005) Chemical weathering in the river basins of the Himalaya, India.
Current Science, v. 89, No. 5, pp. 841-849.
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change and greenhouse gazes. EOS 80(39), pp. 453.
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mobility of major, minor and trace elements during weathering of granitic rocks. Chem. Geol. 68, pp.253-273.
• Neaman, A., Chorover, J. and Brantley, S.L. (2005) Implications of the evolution of organic acid moieties for
basalt weathering over geological time, Ame. J. Sci., 305, pp.147-185.
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mineral weathering. Soil. Sci. 154, pp.226-236.
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•White, A. F. and Brantley, S. L. (1995) Chemical Weathering rates of Silicates minerals: an overview, in white
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dissolution of oxides and aluminosilicates, In: J. I. Drever (ed.), Chemistry of weathering. D. Reidel Pub. Co.,
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