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.
Minerals and rocks can be classified in several ways. Metallic minerals include precious metals like gold and silver, and ferrous metals like iron. Non-metallic minerals do not contain metals and include sulfur and phosphates. Igneous rocks form from cooling magma and include intrusive granites and extrusive basalts. Sedimentary rocks form through deposition and lithification of sediments and make up 75% of the Earth's crust. Metamorphic rocks form from existing rocks undergoing recrystallization under heat and pressure. Common minerals include feldspar, quartz, pyroxene, amphibole, mica and olivine.
Rocks are composed of minerals and are classified based on their origin and formation process. The three main types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling and solidification of magma either deep underground, near the surface, or on the surface. Sedimentary rocks form from the compaction and cementation of sediments. Metamorphic rocks form from the alteration of existing igneous and sedimentary rocks through heat, pressure, and chemical processes usually associated with tectonic activity. Rocks serve many important purposes and understanding their classification provides insight into the geological history of the earth's crust.
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 document discusses the composition and formation of rocks and minerals that make up the Earth's crust. It describes three main types of rocks - igneous, sedimentary, and metamorphic - and how they are formed from the cooling of magma, consolidation of sediments, and alteration of existing rocks respectively. It also discusses the composition and properties of common minerals that form the building blocks of rocks.
This document summarizes the different types of rocks found in Earth's crust and the mineral resources found in Sri Lanka. It discusses three main types of rocks - igneous, sedimentary, and metamorphic rocks - and how they are formed. It then describes some of Sri Lanka's important mineral resources, including gems, graphite, mineral sands, apatite deposits, and various limestone deposits. The majority of Sri Lanka's land is covered by Precambrian metamorphic rocks, with some sedimentary limestone found in the north. Gems, graphite, ilmenite, and apatite are among the key minerals currently being mined and many are important export commodities.
The document discusses different types of rocks:
1. Igneous rocks form from cooling magma and include intrusive granitic rocks, extrusive volcanic rocks like basalt, and hypabyssal rocks.
2. Sedimentary rocks form through the lithification of sediments and include clastic rocks like sandstone, chemical rocks like limestone, and organic rocks like coal.
3. Metamorphic rocks form from the alteration of existing rocks under heat, pressure, and fluids, changing their texture and minerals. Foliated rocks include schist and gneiss, while non-foliated rocks include marble and quartzite.
Students will learn to identify rock types by their observable properties. Working in groups, students will observe samples of igneous, sedimentary, and metamorphic rocks using magnifying glasses. They will draw the rocks' shapes, colors, and minerals. Then students will classify the rocks by type based on discussions of each type's characteristics. Finally, their understanding will be assessed by having students individually identify unlabeled rock samples.
Minerals and rocks can be classified in several ways. Metallic minerals include precious metals like gold and silver, and ferrous metals like iron. Non-metallic minerals do not contain metals and include sulfur and phosphates. Igneous rocks form from cooling magma and include intrusive granites and extrusive basalts. Sedimentary rocks form through deposition and lithification of sediments and make up 75% of the Earth's crust. Metamorphic rocks form from existing rocks undergoing recrystallization under heat and pressure. Common minerals include feldspar, quartz, pyroxene, amphibole, mica and olivine.
Rocks are composed of minerals and are classified based on their origin and formation process. The three main types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling and solidification of magma either deep underground, near the surface, or on the surface. Sedimentary rocks form from the compaction and cementation of sediments. Metamorphic rocks form from the alteration of existing igneous and sedimentary rocks through heat, pressure, and chemical processes usually associated with tectonic activity. Rocks serve many important purposes and understanding their classification provides insight into the geological history of the earth's crust.
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 document discusses the composition and formation of rocks and minerals that make up the Earth's crust. It describes three main types of rocks - igneous, sedimentary, and metamorphic - and how they are formed from the cooling of magma, consolidation of sediments, and alteration of existing rocks respectively. It also discusses the composition and properties of common minerals that form the building blocks of rocks.
This document summarizes the different types of rocks found in Earth's crust and the mineral resources found in Sri Lanka. It discusses three main types of rocks - igneous, sedimentary, and metamorphic rocks - and how they are formed. It then describes some of Sri Lanka's important mineral resources, including gems, graphite, mineral sands, apatite deposits, and various limestone deposits. The majority of Sri Lanka's land is covered by Precambrian metamorphic rocks, with some sedimentary limestone found in the north. Gems, graphite, ilmenite, and apatite are among the key minerals currently being mined and many are important export commodities.
The document discusses different types of rocks:
1. Igneous rocks form from cooling magma and include intrusive granitic rocks, extrusive volcanic rocks like basalt, and hypabyssal rocks.
2. Sedimentary rocks form through the lithification of sediments and include clastic rocks like sandstone, chemical rocks like limestone, and organic rocks like coal.
3. Metamorphic rocks form from the alteration of existing rocks under heat, pressure, and fluids, changing their texture and minerals. Foliated rocks include schist and gneiss, while non-foliated rocks include marble and quartzite.
Students will learn to identify rock types by their observable properties. Working in groups, students will observe samples of igneous, sedimentary, and metamorphic rocks using magnifying glasses. They will draw the rocks' shapes, colors, and minerals. Then students will classify the rocks by type based on discussions of each type's characteristics. Finally, their understanding will be assessed by having students individually identify unlabeled rock samples.
1. UNIT _ I Building Materials Stones.pptxraju863386
This document discusses the classification of stones used in building construction. It describes three main classifications: geological, chemical, and structural. Geologically, stones are classified as igneous, sedimentary, or metamorphic based on their mode of formation. Chemically, they are classified as siliceous, calcareous, or argillaceous based on their dominant chemical component. Structurally, stones can be massive/unstratified, stratified in distinct layers, or foliated with bands of different composition. Common stones used in construction that are described include granite, limestone, sandstone, and slate.
The document discusses petrology and igneous rocks. It defines petrology as the branch of geology dealing with various aspects of rocks, including their formation, classification, properties and structures. It describes igneous rocks as those formed from molten material (magma or lava) that has cooled and crystallized. Igneous rocks are divided into three types based on where they form - volcanic, hypabyssal, and plutonic rocks. Texture in igneous rocks is determined by the size, shape and arrangement of mineral constituents, and can be described based on crystallization, granularity, and fabric.
The document discusses the internal structure of the Earth and the solid part known as the geosphere. It is composed mainly of minerals and rocks. Minerals form over long periods of time through crystallization and are extracted from mines and quarries. Some key minerals mentioned include quartz, the most abundant mineral in the Earth's crust, and graphite. Rocks are aggregates of minerals and can be classified as sedimentary, metamorphic, or igneous based on their formation process. Minerals and rocks have many important uses for buildings, infrastructure, agriculture, and more.
Stones have been used in construction for thousands of years in buildings all over the world. They are classified geologically based on their mode of formation as igneous, sedimentary, or metamorphic rocks. Igneous rocks form from cooling magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks. Stones are also classified chemically based on their dominant composition of silica, calcareous, or argillaceous materials. Structurally, stones can occur as massive unstratified rocks, stratified layered rocks, or foliated banded rocks. Many historical structures were constructed of stone and it remains an important building material.
Stones have been used in construction for thousands of years in buildings all over the world. They are classified geologically based on their mode of formation as igneous, sedimentary, or metamorphic rocks. Igneous rocks form from cooling magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks. Stones are also classified chemically based on their dominant composition of silica, calcareous, or argillaceous minerals. Structurally, stones can occur as massive unstratified rocks, stratified layered rocks, or foliated banded rocks. Many historical structures were constructed of stone and it remains an important building material.
Rocks are composed primarily of minerals and can be categorized into three main types: igneous, sedimentary, and metamorphic. Igneous rocks form from cooling magma underground or lava above ground. Sedimentary rocks form from compression of sediments over time. Metamorphic rocks were once igneous or sedimentary rocks but were changed by heat and pressure within the earth. Common rocks used in construction include granite, limestone, and sandstone.
Radioactive minerals in India include uranium, thorium, and rare metals. Uranium deposits are found in three provinces - Singhbhum, Mahadek, and Cuddapah. The Singhbhum province contains vein-type deposits hosted in schist along the Singhbhum shear zone, including the major deposits at Jaduguda and Bhatin. The Mahadek province hosts large sandstone-type deposits in the Mahadek Formation such as Domiasiat. The Cuddapah province contains unconformity deposits such as Tummalapalle Rachakuntapalle and stratabound deposits. Thorium is found in monazite placers along coastal areas. Rare metals like
This document discusses the geosphere, including the layers of the Earth and their composition. It describes the crust, mantle, and core, and the discontinuities that separate them. It also summarizes the characteristics of minerals and rocks, including their physical properties, types of rocks, and how rocks are used and extracted.
The document discusses the three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from cooling lava and can have large or small crystals depending on the cooling rate. Sedimentary rocks form from compressed sediments and contain fossils. Metamorphic rocks form from existing rocks undergoing heat and pressure, and can have banded or non-banded textures.
Igneous rocks are formed by the cooling and solidification of magma. They are classified based on their texture, mineral composition, and mode of formation. The three main types are volcanic, plutonic, and hypabyssal rocks. Common igneous rocks include granite, basalt, pumice, and diorite. Granite is widely used in construction due to its hardness, frost resistance, and high compressive strength. Basalt is used for building blocks, cobblestones, and insulation. Engineering considerations for igneous rocks include alkali-silica reactivity and using weathered rocks for foundations.
This document provides an overview of minerals, rocks, and the rock cycle presented by a student from Suez University. It discusses the main topics of minerals, igneous rocks, sedimentary rocks, and metamorphic rocks. Specifically, it describes the composition and properties of minerals, how the three main rock types are formed through igneous, sedimentary, and metamorphic processes, and provides examples of common rock types for each category. The document aims to educate the reader on basic concepts in petrology and the classification of earth materials.
building materials1_architecture_Classification of rocks, Sources, Seasoning, Quarrying of stones, Dressing, Characteristics of
stones, Testing of stones, Common building stones and their uses. Masonary and paving. Stone
veneering, preservation of stones Deterioration of stones, Durability, Preservation, Selection of
stones, Artificial stones.
The document discusses the three main types of rocks: igneous, sedimentary, and metamorphic. It provides details on their origin, formation process, structure, texture, types, and examples. Key differences are noted - igneous rocks form from cooled lava/magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks due to heat and pressure. The conclusion states the three rock types can be identified by their characteristics but may also transition between types through the rock cycle.
The document discusses the materials that make up Earth's crust. It describes how rocks are composed of minerals, and lists some of the most common rock-forming minerals like quartz, feldspar, mica, and calcite. It also categorizes the main types of rocks as igneous, sedimentary, and metamorphic, and provides details on their formation processes.
The document discusses minerals, rocks, and the rock cycle. It defines minerals as naturally occurring inorganic substances with distinct properties based on their atomic structure. There are over 2000 known minerals that form six major rock-forming groups. Rocks are aggregates of minerals and are classified as igneous, sedimentary, or metamorphic based on their formation. Igneous rocks form from cooling magma, sedimentary rocks form through deposition and lithification of sediments, and metamorphic rocks form from changes to existing rocks through heat, pressure, and stress. The rock cycle describes how rocks continuously transform between these types through geological processes.
1. Rocks are classified into three main types based on their genesis: igneous rocks which form from solidified magma, sedimentary rocks which form from compressed sediments, and metamorphic rocks which form from existing rocks undergoing changes due to heat, pressure, or water.
2. Igneous rocks such as granite and basalt form from magma and are divided into plutonic rocks which solidify deep underground and volcanic rocks which solidify above ground. Sedimentary rocks such as limestone and sandstone form from compressed sediments and contain layers and fossils. Metamorphic rocks such as marble and quartzite form from changes to existing rocks caused by heat, pressure, and water.
Minerals form in nature through geological processes under varying physical and chemical conditions. This results in diversity in their properties and structures, which determines how easily they can be extracted from formations like veins, lodes, or sedimentary layers. Minerals are classified as metallic, non-metallic, or energy minerals. While providing valuable resources, mineral extraction is also depleting finite reserves and increasing in cost as the highest quality deposits are used first over time. The document then provides information on major mineral deposits in India for minerals like manganese, copper, mica, limestone, bauxite, petroleum, and coal, as well as sources of energy like hydroelectric, thermal, nuclear power.
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.
1. UNIT _ I Building Materials Stones.pptxraju863386
This document discusses the classification of stones used in building construction. It describes three main classifications: geological, chemical, and structural. Geologically, stones are classified as igneous, sedimentary, or metamorphic based on their mode of formation. Chemically, they are classified as siliceous, calcareous, or argillaceous based on their dominant chemical component. Structurally, stones can be massive/unstratified, stratified in distinct layers, or foliated with bands of different composition. Common stones used in construction that are described include granite, limestone, sandstone, and slate.
The document discusses petrology and igneous rocks. It defines petrology as the branch of geology dealing with various aspects of rocks, including their formation, classification, properties and structures. It describes igneous rocks as those formed from molten material (magma or lava) that has cooled and crystallized. Igneous rocks are divided into three types based on where they form - volcanic, hypabyssal, and plutonic rocks. Texture in igneous rocks is determined by the size, shape and arrangement of mineral constituents, and can be described based on crystallization, granularity, and fabric.
The document discusses the internal structure of the Earth and the solid part known as the geosphere. It is composed mainly of minerals and rocks. Minerals form over long periods of time through crystallization and are extracted from mines and quarries. Some key minerals mentioned include quartz, the most abundant mineral in the Earth's crust, and graphite. Rocks are aggregates of minerals and can be classified as sedimentary, metamorphic, or igneous based on their formation process. Minerals and rocks have many important uses for buildings, infrastructure, agriculture, and more.
Stones have been used in construction for thousands of years in buildings all over the world. They are classified geologically based on their mode of formation as igneous, sedimentary, or metamorphic rocks. Igneous rocks form from cooling magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks. Stones are also classified chemically based on their dominant composition of silica, calcareous, or argillaceous materials. Structurally, stones can occur as massive unstratified rocks, stratified layered rocks, or foliated banded rocks. Many historical structures were constructed of stone and it remains an important building material.
Stones have been used in construction for thousands of years in buildings all over the world. They are classified geologically based on their mode of formation as igneous, sedimentary, or metamorphic rocks. Igneous rocks form from cooling magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks. Stones are also classified chemically based on their dominant composition of silica, calcareous, or argillaceous minerals. Structurally, stones can occur as massive unstratified rocks, stratified layered rocks, or foliated banded rocks. Many historical structures were constructed of stone and it remains an important building material.
Rocks are composed primarily of minerals and can be categorized into three main types: igneous, sedimentary, and metamorphic. Igneous rocks form from cooling magma underground or lava above ground. Sedimentary rocks form from compression of sediments over time. Metamorphic rocks were once igneous or sedimentary rocks but were changed by heat and pressure within the earth. Common rocks used in construction include granite, limestone, and sandstone.
Radioactive minerals in India include uranium, thorium, and rare metals. Uranium deposits are found in three provinces - Singhbhum, Mahadek, and Cuddapah. The Singhbhum province contains vein-type deposits hosted in schist along the Singhbhum shear zone, including the major deposits at Jaduguda and Bhatin. The Mahadek province hosts large sandstone-type deposits in the Mahadek Formation such as Domiasiat. The Cuddapah province contains unconformity deposits such as Tummalapalle Rachakuntapalle and stratabound deposits. Thorium is found in monazite placers along coastal areas. Rare metals like
This document discusses the geosphere, including the layers of the Earth and their composition. It describes the crust, mantle, and core, and the discontinuities that separate them. It also summarizes the characteristics of minerals and rocks, including their physical properties, types of rocks, and how rocks are used and extracted.
The document discusses the three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from cooling lava and can have large or small crystals depending on the cooling rate. Sedimentary rocks form from compressed sediments and contain fossils. Metamorphic rocks form from existing rocks undergoing heat and pressure, and can have banded or non-banded textures.
Igneous rocks are formed by the cooling and solidification of magma. They are classified based on their texture, mineral composition, and mode of formation. The three main types are volcanic, plutonic, and hypabyssal rocks. Common igneous rocks include granite, basalt, pumice, and diorite. Granite is widely used in construction due to its hardness, frost resistance, and high compressive strength. Basalt is used for building blocks, cobblestones, and insulation. Engineering considerations for igneous rocks include alkali-silica reactivity and using weathered rocks for foundations.
This document provides an overview of minerals, rocks, and the rock cycle presented by a student from Suez University. It discusses the main topics of minerals, igneous rocks, sedimentary rocks, and metamorphic rocks. Specifically, it describes the composition and properties of minerals, how the three main rock types are formed through igneous, sedimentary, and metamorphic processes, and provides examples of common rock types for each category. The document aims to educate the reader on basic concepts in petrology and the classification of earth materials.
building materials1_architecture_Classification of rocks, Sources, Seasoning, Quarrying of stones, Dressing, Characteristics of
stones, Testing of stones, Common building stones and their uses. Masonary and paving. Stone
veneering, preservation of stones Deterioration of stones, Durability, Preservation, Selection of
stones, Artificial stones.
The document discusses the three main types of rocks: igneous, sedimentary, and metamorphic. It provides details on their origin, formation process, structure, texture, types, and examples. Key differences are noted - igneous rocks form from cooled lava/magma, sedimentary rocks form from compressed sediments, and metamorphic rocks form from changes to existing rocks due to heat and pressure. The conclusion states the three rock types can be identified by their characteristics but may also transition between types through the rock cycle.
The document discusses the materials that make up Earth's crust. It describes how rocks are composed of minerals, and lists some of the most common rock-forming minerals like quartz, feldspar, mica, and calcite. It also categorizes the main types of rocks as igneous, sedimentary, and metamorphic, and provides details on their formation processes.
The document discusses minerals, rocks, and the rock cycle. It defines minerals as naturally occurring inorganic substances with distinct properties based on their atomic structure. There are over 2000 known minerals that form six major rock-forming groups. Rocks are aggregates of minerals and are classified as igneous, sedimentary, or metamorphic based on their formation. Igneous rocks form from cooling magma, sedimentary rocks form through deposition and lithification of sediments, and metamorphic rocks form from changes to existing rocks through heat, pressure, and stress. The rock cycle describes how rocks continuously transform between these types through geological processes.
1. Rocks are classified into three main types based on their genesis: igneous rocks which form from solidified magma, sedimentary rocks which form from compressed sediments, and metamorphic rocks which form from existing rocks undergoing changes due to heat, pressure, or water.
2. Igneous rocks such as granite and basalt form from magma and are divided into plutonic rocks which solidify deep underground and volcanic rocks which solidify above ground. Sedimentary rocks such as limestone and sandstone form from compressed sediments and contain layers and fossils. Metamorphic rocks such as marble and quartzite form from changes to existing rocks caused by heat, pressure, and water.
Minerals form in nature through geological processes under varying physical and chemical conditions. This results in diversity in their properties and structures, which determines how easily they can be extracted from formations like veins, lodes, or sedimentary layers. Minerals are classified as metallic, non-metallic, or energy minerals. While providing valuable resources, mineral extraction is also depleting finite reserves and increasing in cost as the highest quality deposits are used first over time. The document then provides information on major mineral deposits in India for minerals like manganese, copper, mica, limestone, bauxite, petroleum, and coal, as well as sources of energy like hydroelectric, thermal, nuclear power.
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
Rural and urban settlement in Rwanda is discussed. There are four main types of rural settlements: clustered, dispersed, linear, and planned. Planned rural settlements (imidugudu) were established by the government to improve living standards. However, they also have disadvantages like improper waste disposal and lack of space. Urban centers have characteristics like higher population, employment, and infrastructure but also issues like traffic, high costs, and slum settlements. The document provides details on rural and urban settlements in Rwanda.
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
1. Fieldwork involves learning activities conducted outside the classroom to gather new information. Various methods are used to collect primary and secondary data, including observation, questionnaires, interviews, records analysis, sampling, and measurement.
2. The key steps in fieldwork include pre-field preparation, pilot study, data collection, and follow-up. Data collection methods have advantages and disadvantages that researchers must consider for their specific studies.
3. Presenting findings involves organizing, analyzing, and communicating the data through written reports, displays, presentations and other methods. Careful planning is needed to address challenges that may arise during fieldwork.
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
The document discusses elements of maps, including:
1. Maps contain specific elements like a title, key, compass, and scale to help readers understand the information represented.
2. Contours are lines on maps that connect points of equal elevation and show the shape and steepness of landscapes.
3. Relief on maps can be shown through methods like layer tinting, contours, spot heights, and hachures that represent elevation changes through color shading and line spacing.
This document defines key concepts related to landforms and relief features. It discusses different types of slopes like concave, convex, gentle and steep slopes. It also defines concepts like altitude, contours, and different types of continental relief features such as mountains, hills, plateaus, ridges and valleys. Marine relief features of the ocean floor are also explained, including continental shelves, slopes, rises, trenches and abyssal plains. Examples are given for many relief features. The document concludes by discussing the relationship between different relief features and human activities.
The document defines soil and outlines the key processes involved in soil formation, including weathering, leaching, eluviation, and illuviation. It also discusses the major components that make up soil, such as minerals, organic matter, water, and air. Additionally, the document examines important soil properties like texture, structure, color, depth, density, permeability, consistency, pH levels, and nutrient status. Soil profiles, catenas, and the major types of soils are also defined. The roles soils play in supporting agriculture, construction, and other human activities are highlighted.
The document provides an introduction to geography, defining it as the study of the Earth and its features. It discusses the origin of the word geography from Greek roots meaning "Earth" and "to write." The Greek philosopher Eratosthenes published the first book about the Earth and is considered the father of geography. The document also outlines key branches of geography like physical, human/economic geography and practical geography. It provides definitions and examples of the tools and techniques used by geographers to study and describe the Earth's surface.
The document describes the structure of the Earth, including its external and internal components. Externally, the Earth is made up of the atmosphere, hydrosphere, lithosphere, and biosphere. Internally, it consists of the crust, mantle, and core. The crust is the outermost layer and is divided into continental and oceanic crust. Below the crust lies the mantle, which makes up most of the Earth's volume and is divided into upper and lower sections. The innermost layer is the core, with a solid inner core and liquid outer core.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
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Answers about how you can do more with Walmart!"
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
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9
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Unit 4 Rocks and minerals.pptx
1. Unit 4: Rocks and
minerals in
Rwanda
08/02/2023 12:05 carra Dusabimana Jean D Amour 1
2. By the end of this unit, you
should be able to:
1.Identify the different types of minerals and rocks
in Rwanda
2.Locate the major minerals and rocks in Rwanda
3.Recall the economic importance of rocks and
minerals.
08/02/2023 12:05 carra Dusabimana Jean D Amour 2
3. Types of minerals and rocks in Rwanda
Mineral: is a natural and
inorganic solid with definite
chemical composition and
characteristic physical
properties.
08/02/2023 12:05 carra Dusabimana Jean D Amour 3
Rock is a naturally occurring solid
that is made up one or more
minerals.
Examples of minerals
are quartz (Sio₂), iron
(Fe), aluminium (al),
etc.
Examples of
Rocks are slate,
marble, quartzite,
samdstone, etc
4. Brief history of Rwandan rocks and
minerals
In Rwanda the largest parts are made up of Burundian
rocks (1050-980 million years). These are associated
with the folded sediments of Western and Eastern
Provinces.
These are rocks that changed their mineralogical and
chemical compositions due to metamorphism.
08/02/2023 12:05 carra Dusabimana Jean D Amour 4
5. 08/02/2023 12:05 carra Dusabimana Jean D Amour 5
Shist
The specific examples include schist and quartzite that were
exposed forming granite. These rocks occupy the greatest part of
Rwanda
Shist and Quartzite
7. Physical properties of rocks
• Rocks have different colors: black for basalt, red for ironstones,
white for quartzite and gypsum, etc.
• Hardness: the ability of rocks to resist scratching. Some rocks
are hard and others are soft.
• Rocks have different texture: size of their components or crystals.
• Some rocks are permeable (loose, fractured and porous to permit
the absorption of water) and others are impermeable.
• Rocks have different density
• Some rocks are consolidated like granite, quartzite, etc. others
are unconsolidated or loose like sand and gravels
• Luster: light reflected from the surface of a mineral or a rock.
The luster may be metallic or non metallic.
08/02/2023 12:05 carra Dusabimana Jean D Amour 7
9. Chemical properties of Rocks
• Chemical composition
• Solubility and insolubility in water
• Oxidation that is the reaction with oxygen
• Carbonation that is the reaction with carbonic acid
08/02/2023 12:05 carra Dusabimana Jean D Amour 9
10. Rocks of Rwanda
1. Igneous rocks: These
are rocks that result
from the cooling and
solidification of
magma. Located in the
north western and the
south western regions
of Rwanda.
08/02/2023 12:05 carra Dusabimana Jean D Amour 10
11. Types of igneous rocks in Rwanda
1. They are into two types:
1. Extrusive rocks: They formed when lava solidified at
the surface. These extrusive rocks are basalt, obsidian,
ashes and cinders, etc. They are abundant in Northern
Province (Musanze and Burera) and in Western
Province (Nyabihu, Rubavu, Rutsiro, Rusizi and
Nyamasheke districts). They are dark because they
come from basic and fluid lava.
2. Intrusive or plutonic rocks: They are formed when the
magma solidifies in deep rock layers before reaching
the surface land. Eg: granite, diorite, gabbros, etc.
They are found under the highlands of Rwanda and
they appear on the steep slopes. They are used as
queries to get stones, sand, etc.
08/02/2023 12:05 carra Dusabimana Jean D Amour 11
13. 2. Sedimentary rocks: rocks are formed from weathered and eroded materials
of the already existing rocks.
• Mechanically formed because deposited by running water in the valleys
and in depression where they are known as alluvium. Eg: silt, sand,
sandstones, mudstones, etc.
• Organically formed sedimentary rocks by decomposition of organic matter.
Ex. Limestone in Bugarama plain and close to Nyabarongo valley near to Kigali;
Peat, coal in most of swamps of Rwanda and Methane gas in Lake Kivu.
3. Metamorphic rocks: They are formed from either igneous or sedimentary
rocks under the influence of greater pressure and heat. Most of metamorphic
metamorphic rocks are found under the highland of Rwanda because caused
caused by pressure and heat from compression tectonic forces and molten
molten rocks in motion under the crust (Birunga region). Eg: quartzite, slate,
slate, gneiss, schist, hornblende,
08/02/2023 12:05 carra Dusabimana Jean D Amour 13
16. In Rwanda, there are several quarries where we exploit metamorphic rocks.
Almost 80% rocks of Rwanda are metamorphic and igneous origin. These
rocks found in Rwanda contain minerals necessary for economic development
of Rwanda.
Importance of rocks and minerals
Soil formation: rocks are parent material out of which soil particles are
Construction and building: some rocks of the earth’s crust are used in
construction and building activities;
Tourism: some rocks constitute beautiful landscape and hence attract
Energy: some rocks act as a source of energy needed to run industrial
Example: coal.
Fertilizers: rocks are very useful in the manufacturing of fertilizers. For
phosphate bearing rocks are used to make phosphate fertilizers.
Mining: Some rocks contain valuable minerals which are sources of foreign
exchange.
Salt rocks are edible.
Source of water, some ore used as ornaments
Millstones and grindstones
08/02/2023 12:05 carra Dusabimana Jean D Amour 16
17. Igneous rocks are characterised by the following features
• They are formed after the cooling and solidification of molten material.
material.
• They have a crystal appearance after cooling and solidification.
• They do not have strata or layers.
• They have no fossils.
Metamorphic rocks are characterised by the following features.
• They are harder and more compact than primary pre-existing rocks.
• The minerals in these rocks are recrystallised.
Sedimentary rocks are characterised by the following features:
• They have fossils.
• They have both inorganic and organic materials.
• They have no crystalline look because they do not form under the
influence of heat.
• They have rock layers known as strata as a result of the different and
successive deposition of sediments at different intervals 17
20. Revision questions
1. Define a rock.
2. State the three types of rocks found in Rwanda.
3. With a detailed explanation show how the following rocks were formed in
Rwanda.
a) Igneous rocks
b) Sedimentary rocks
c) Metamorphic rocks
4. Describe the characteristics of the different types of rocks.
5. Explain the economic importance of rocks.
6. In relation to the geology of Rwanda, write short notes on the young volcanic
rocks.
7. “Rocks are good and bad” discuss this statement in relation to the Rwandan
context.
8. Distinguish between rocks and minerals.
9. With specific examples, cite various minerals found in Rwanda.
10. Explain their contribution to the economic development of Rwanda
20
Dynamic- due to pressure change (Kinetic or regional metamorphism). The pressure is caused by compressional force which cause earth movements and bring about mountain building
Thermal- due to intense heat (Contact metamorphism). Rocks change physically and chemically as a result of great heat originating from molten rock or magma.
Thermal-dynamic a combination of heat and pressure.
limestone helps in cement making, clay is used to manufacture bricks and tiles, granite broken into pieces can be used to make tarmac roads.
Examples are Ibere rya Bigogwe (Bigogwe Breast), Urutare rwa Ndaba (Ndaba Rock) and Urutare rwa Kamegeri (Kamegeri Rock).