This document provides an overview of rocks, including their definition, types, characteristics, and importance. It discusses the three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling of magma, sedimentary rocks form through the compaction and cementation of sediments, and metamorphic rocks form from changes to pre-existing rocks through heat and pressure. The document also outlines key characteristics and formation processes for each rock type, and describes their economic and other importance, as well as some disadvantages.
The texture of a rock refers to the size, shape, and arrangement of its constituent mineral grains.
The major textures in igneous are Glassy, aphanitic, phaneritic, Porphyritic, and Pyroclastic.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
A presentation on Hydrothermal wall rock alteration with case studies on geophysical applications.
References : https://drive.google.com/drive/folders/16VSZMPMASMNVB47JdBUa_7udBk1qvK2U?usp=sharing
The texture of a rock refers to the size, shape, and arrangement of its constituent mineral grains.
The major textures in igneous are Glassy, aphanitic, phaneritic, Porphyritic, and Pyroclastic.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
A presentation on Hydrothermal wall rock alteration with case studies on geophysical applications.
References : https://drive.google.com/drive/folders/16VSZMPMASMNVB47JdBUa_7udBk1qvK2U?usp=sharing
IGNEOUS ROCKS AND THEIR PROPERTIES, USES AND DIFFERENT VARITIES OF VOLCANIC INTRUSIONS , MEGASCOPIC PROPERTIES OF VARIOUS IGNEOUS ROCKS
PROPERTIES AND USES OF IGNEOUS ROCKS
CHARECTERSTICS OF IGNEOUS ROCKS WITH FIGURES
Definition, metamorphism.
limits and type of metamorphic agents.
Metamorphic processes.
Types of Metamorphism
Classification of metamorphic rocks and textures of metamorphic rocks
Mineral assemblages and Metamorphic grade and facies of metamorphic rocks.
Graphic representation of metamorphic mineral parageneses.
Process of Transport and Generation of Sedimentary StructuresAkshayRaut51
sedimentary structures ,sedimentary rocks ,weathering and erosion ,sediment transport mechanism ,hjulstrom curve ,types of flow of sediments ,reynold number ,froude number ,laminations ,bedding plane ,cross bedding ,herringbone structure ,ripple marks ,graded bedding ,sole marks ,mud cracks ,ball and pillow structures ,stylolites ,concretion ,nodules
IGNEOUS ROCKS AND THEIR PROPERTIES, USES AND DIFFERENT VARITIES OF VOLCANIC INTRUSIONS , MEGASCOPIC PROPERTIES OF VARIOUS IGNEOUS ROCKS
PROPERTIES AND USES OF IGNEOUS ROCKS
CHARECTERSTICS OF IGNEOUS ROCKS WITH FIGURES
Definition, metamorphism.
limits and type of metamorphic agents.
Metamorphic processes.
Types of Metamorphism
Classification of metamorphic rocks and textures of metamorphic rocks
Mineral assemblages and Metamorphic grade and facies of metamorphic rocks.
Graphic representation of metamorphic mineral parageneses.
Process of Transport and Generation of Sedimentary StructuresAkshayRaut51
sedimentary structures ,sedimentary rocks ,weathering and erosion ,sediment transport mechanism ,hjulstrom curve ,types of flow of sediments ,reynold number ,froude number ,laminations ,bedding plane ,cross bedding ,herringbone structure ,ripple marks ,graded bedding ,sole marks ,mud cracks ,ball and pillow structures ,stylolites ,concretion ,nodules
Earth materials, internel structure of the earth, composition of the earth Jahangir Alam
Internal Structure of the Earth
The Processes that Change the Shape of the Earth
Composition of the Earth
Basic Rocks Types
Common Rock Forming Minerals
Rwanda's power sector is dominated by hydropower, which accounts for over 90% of the country's electricity generation. The country also has a small thermal power plant and a number of solar and mini-hydropower plant. On the other hand, Rwanda's energy sector is also dominated by biomass, which accounts for over 80% of the country's energy consumption. The country also uses some electricity, imported petroleum products and solar energy. Rwanda's power and energy sector is still under development, but it is making significant progress. The government is committed to improving the sector, and it is playing an increasingly important role in the country's economic development.
Transport: Rwanda has a well-developed road network, with over 12,000 kilometers of paved roads. Rwanda has two international airports, Kigali International Airport and Kamembe International Airport.
Communication: Rwanda has a modern telecommunications system, with over 80% mobile phone penetration. The country also has a fiber optic network, which provides high-speed internet access.
Trade: Rwanda is a member of the East African Community (EAC), which allows for free trade between member countries. The country also has trade agreements with other countries, including the United States, China and the European Union.
Rwanda's transport, communication and trade systems are essential for the country's economic development. They provide the infrastructure that businesses need to operate and grow, and they help to connect Rwanda to the global economy.
Agriculture refers to the growing of crops and rearing of animals for either subsistence or for commercial purposes.
Agriculture in Rwanda is divided into two main parts.
Crop cultivation (crop husbandry
Livestock farming (animal husbandry
Settlement is a place where people live (shelter).
Rural settlement is people’s shelter (house) found in countryside or in rural areas (outside the urban areas).
The vegetation is a set of plants that cover the earth’s surface.
Types of vegetation of Rwanda
There are two main types of vegetation:
Natural vegetation and
Artificial vegetation.
Drainage refers to the distribution of water on the surface of the Earth. Surface water in Rwanda is distributed in rivers, lakes and wetlands such as swamps.
Drainage systems are patterns formed by the streams, rivers and lakes in a particular drainage basin
Drainage basin is an area of land drained by a river and its tributaries
River system: A river and its tributaries
Water shed: an imaginary lines separating drainage basins
River reversal refers to the change of a river’s direction of flow due to an obstacle
The major lakes and their mode of formation
Climate refers to the average weather conditions of an area measured and recorded for a long period of time, usually over 35 years.
Rwanda is said to have temperate of highland climate. For this climate, the annual mean temperature is around 20⁰c and average annual total of rainfall for all the country is 1200 mm.
Factors that influence the climate of Rwanda
Describe the relationship between climate and human activities in Rwanda
Rwanda is a few miles away from the equator, yet her climate is not truly equatorial. Why?
Population is the total number of people living in a given area (country, province, continent, etc.) at a specified period of time.
Population distribution refers to the spread of people in an area where they live over a period of time.
Population density: It is the population per unit of area expressed in inhabitants per square kilometer of land area.
Population density of an area can be:
Low: with 1-10 inhabitant/km²,
Moderate: with 10-50 inhabitant/km² and
High: with more than 50 inhabitant/km².
Factors of population distribution in Rwanda
Identify the different types of minerals and rocks in Rwanda
Locate the major minerals and rocks in Rwanda
Recall the economic importance of rocks and minerals.
By the end of this unit, a learner should be able to:
State the different types of soil in Rwanda
Identify the causes and effects of soil erosion in Rwanda
Identify the importance of soils in Rwanda.
Identify different components of the universe.
Describe the Earth and the solar system.
State the Earth’s movements and their consequences.
Show the relationship between longitude and time.
Define latitude and longitude
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
2. LEARNING OBJECTIVES
In this unit, the will should be able to:
• Define the term rocks.
• State the types of rocks.
•State the characteristics of rocks.
• Outline the importance of rocks.
3. DEFINITION OF ROCKS
A rock is a naturally occurring solid
made up of two or more minerals.
Rocks form the solid part of the
earth’s crust.
A mineral: is a natural inorganic
substance possessing a definite
chemical composition. Minerals are
found below the earth’s surface.
Rocks are studied under the
scientific study called Petrology.
Quartz - Mineral
Feldspar Biotite
4. TYPES OF ROCKS
Rocks are classified based on three main characteristics:
a) Chemical composition: mineral composition
b) Physical properties such as permeability, texture, and the size of
mineral particles
c) Their mode of formation
Therefore, there are three main types of rocks namely;
1. Igneous rocks,
2. Sedimentary rocks, and
3. Metamorphic rocks.
5. IGNEOUS ROCKS
Igneous rocks are formed when magma cools and
solidifies inside or on the earth’s surface.
Igneous rocks have four classes according to the
chemical composition; acidic, intermediate, basic,
and ultrabasic rocks.
Type of rock Presence of
silica (%)
Presence of basic
oxides (%)
Acidic Less than 65 35
intermediate 55-65 35-45
Basic 45-55 45-65
Ultrabasic Less than 45 Greater than 55
Table showing chemical composition of igneous rocks
6. CHARACTERISTICS OF IGNEOUS ROCKS
✓They are formed by the cooling of magma which solidifies
into or onto the earth’s surface
✓ They contain crystals after
cooling
✓ They do not contain strata
(layers)
✓ They do not have fossils
(plant and animal remains).
7. TYPES IGNEOUS ROCKS
There are two types of igneous rocks. They are intrusive and
extrusive igneous rocks.
a) Intrusive igneous rocks: these are formed when magma cools
and solidifies inside the earth’s surface. They are also known
as plutonic rocks.
Examples: Diorite, dolerite, granite, gabbro, peridotite, diabase,
porphyry, and lamprophyre.
Notice: rocks that cool and solidify near the earth’s surface are
known as hypabyssal rocks. They include, porphyrite, diabase,
lamprophyre, and granophyre.
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8.
9. b) Extrusive igneous rocks: these are formed when magma cools and
solidifies on the earth’s surface. They are also known as Volcanic
rocks.
There are two types of extrusive igneous rocks formed by lava flows
and volcanic ejecta.
❖Extrusive igneous rocks formed by lava flows: these are formed
lava flows a long distance on the earth’s surface before it cools
and solidifies to form extrusive igneous rocks. Example are basalt
and obsidian
❖Extrusive igneous rocks formed by volcanic ejecta: these are
formed when solid ash and semi-liquid materials ejected out of the
earth’s surface cool and solidify as they fall back onto the earth’s
surface. Examples are pumice and tuff rocks.
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10. SEDIMENTARY ROCKS
Sedimentary rocks are formed by erosion, deposition, and compaction of
weathered or eroded materials of former rock masses at the earth’s
surface and within water bodies. They are formed through the process of
sedimentation.
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Sedimentation: this is the
process that causes
mineral and other organic
particles to settle and
accumulate.
Sedimentation of Rocks Sedimentary rocks
12. CHARACTERISTICS OF SEDIMENTARY ROCKS
Characteristics of sedimentary rocks are the following:
❖ They contain both organic (plant and animal) and inorganic deposits
❖ They are laid down in strata (layers)
❖ They contain fossils (plant and animal remains)
❖ They are non crystalline because they do not form under heat.
They are laid down in strata
Skeleton of the bird-like specimen (Aurornis xui)
found in Yizhou Fossil & Geology Park, China
13. HOW SEDIMENTARY ROCKS FORM
There are three ways through which sedimentary rocks are
formed:
1) The pre-existing rocks are weathered and eroded and
broken into small crystals to form sediments (weathering
and erosion)
2) The weathered and eroded particles are transported and
deposited in layers by water, wind, and moving ice.
3) Thereafter, the sediments are compacted to become hard
rocks by the influence of pressure from the overlying
sediments and other materials.
14. TYPES OF SEDIMENTARY ROCKS
a) Mechanically (Physically) formed sedimentary rocks: these rocks are
formed when sediments are transported and deposited either on land
or sea by the agents of erosion, then after they are consolidated and
hardened to form hard rocks by the pressure from overlying layers.
Examples:
i. Sandstone and gritstone: composed of rock particles mainly sand
ii. Conglomerate, breccia and boulder clay; composed of rock
particles larger than 2mm in diameter,
iii. clay stone: composed of very small rock particles.
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15.
16. b) Chemically formed sedimentary rocks: these are formed when salt
and other soluble minerals are precipitated, evaporate and
accumulate in layers by the influence of rain, temperature, and
pressure.
Classification of chemically formed sedimentary rocks
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Classification Examples of rocks Composition
Carbonates Travertine, trona,
dolomite
Calcium carbonate
compounds
Sulphates Gypsum Calcium sylphate
Chlorides Rock salt Sodium chloride
Silicates Flint Silica
Iron stones Limonite, hematite Iron oxides
17.
18. c) Organically formed sedimentary rocks: these rocks are formed when
remains of plants and animals accumulate in layers over time. Then
after they are compacted by the pressure from overlying materials
hence to form hard rocks.
Classification of organically formed sedimentary rocks
1/11/2023
Classification Examples of rocks Composition
Calcareous Limestone, chalk, coral
reef
Skeletons of tiny marine
creatures
Ferruginous Iron stone Hydrated iron oxide
Siliceous Diatomite Remains of diatoms rich in
silica
Carbonaceous Coral (lignite coal,
bituminous coal, brown
coal, anthracite coal)
Remains of plants
19.
20. METAMORPHIC ROCKS
These rocks are formed when pre-existing rocks are subjected to
chemical or physical changes under the influence of heat and pressure.
Types of metamorphic rocks
1/11/2023
Original rock
Metamorphic rock
Classification Type of rock
Igneous
Granite Gneiss
Augite Hornblende
Sedimentary
Shale Schist
Clay Slate
Sandstone Quartzite
Limestone Marble
Mudstone Slate
Coral Graphite
21. CHARACTERISTICS OF
METAMORPHIC ROCKS
Characteristics of metamorphic rocks are the following:
❖ They are formed through a metamorphism process.
❖They are more resistant to erosion
❖ They are formed by chemical or physical changes from
the existing rocks
❖ They are crystalline and often have a squashed (foliated
or banded) texture.
22. FORMATION OF METAMORPHIC ROCKS
Metamorphic rocks are formed in two ways:
a) Contact metamorphism: this is when igneous rocks come
into contact with other rocks and change their chemical
and physical structure to form metamorphic rocks.
a) Dislocation (region metamorphism): this is when a large
region is subjected to different temperature conditions by
the advancing igneous rock. Instead dislocation occurs
along a line of weakness or fault follows a volcanic pipe.
23. CHARACTERISTICS OF ROCKS
Rocks are characterized by the following features:
✓Rock color: the color of rocks gives a hint about its mineral composition. For example; gold
is yellow and copper is reddish brown
✓Rock texture and grain size: this determines the size of the individual grain that form the
rocks.
✓Rock structure: this is the arrangement of the minerals that form the rocks. It determines
the shape and the mode of formation of the rocks.
✓Rock composition: this is the composition of minerals that form the rock. It determines the
origin of the rocks
✓Rock hardness: this is the level of rock resistance to being broken or scratched. It
determines how rocks may have been formed.
✓Rock density: this refers to the weight of rocks. It determines how rocks are heavy.
✓Rock luster: this refers to the rock brightness. It determines how rocks reflect the light.
✓Rock cleavage: this refers to how rocks break. It determines the way by which rocks break
✓Rock taste and odor: this refers to rock porosity. It determines how rocks allow water to
pass or not pass through them
✓Rock solubility: this determines the level at which rocks dissolve in water. 1/11/2023
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24.
25. IMPORTANCE OF ROCKS
❖Some rocks provide raw materials for industries leading to industrialization
❖Some rocks are extracted to provide building and constructional materials for
example sandstone, limestone etc.
❖Some rocks contain valuable minerals such as gold, diamond, copper that are
exported to earn foreign exchange
❖Some rocks are extracted and used in art in the making of carvings that are sold to
earn income
❖Some rocks such as coal are source of energy for industrial and domestic uses
❖Some rocks such as rock salt are used as a healthy substitute of common salt
❖Some rocks when weathered provide fertile soils good for crop growing
❖Some rocks such as phosphates, calcium are used as fertilizers
❖Some rock formation like granite tors and coral reefs are tourist attraction sites
❖Some rocks store underground water which can be extracted and used for domestic
and industrial and agriculture
Therefore, rocks are used in promoting different economic sectors that boost the
country’s development. However they have some disadvantages.
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26. DISADVANTAGES OF ROCKS
Some rocks have the following disadvantages on human activities:
❖Some rocks are obstacles and may hinder cultivation activities
❖They may also hinder road construction activities
❖Some rocks are very porous provide infertile soils that may reduce cultivation yield
❖Some rocks may hinder mining activities because they require much expenses for
their extraction
❖Some rock formation results in rock mountainous may hinder transport and
communication