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GEOGRAPHY OBJ AND PRACTICAL.
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GEOGRAPHY PRACTICAL ANSWERS
(2a)
(i) Core: Innermost layer, about 3476km wide all round, consists largely of iron and nickel, divisible into inner and outer core, found in a molten state, reservoir of minerals to the other zones.
(ii) Mantle: middle layer, surrounds the core, about 2897km thick, composed of very dense rocks, rocks are rich in olivine basalt.
(iii) Crust: Lies above the mantle, outer layer, consists of granitic and basaltic rocks, varies in thickness from place to place , divisible into 2-sial and sima, forms soil, sustains life.
(2b)
(PICK ANY FOUR)
(i) Provides a habitat for plants and animals: The surface layer of the Earth's crust provides a stable and habitable environment for a wide range of organisms. It provides the necessary conditions for life, such as sunlight, water, and nutrients.
(ii) Source of minerals: The surface layer of the Earth's crust contains a variety of minerals that are essential for human activities. These minerals include metals, such as iron, copper, and gold, as well as non-metallic minerals, such as sand, gravel, and clay.
(iii) Source of water: The surface layer of the Earth's crust is home to a variety of water bodies, including oceans, lakes, rivers, and aquifers. These water bodies provide essential resources for human consumption, agriculture, and industry.
(iv) Supports human activities: The surface layer of the Earth's crust provides a stable foundation for human activities, such as agriculture, construction, and transportation. It also provides scenic beauty and recreational opportunities.
(v) Regulates the Earth's climate: The surface layer of the Earth's crust plays a role in regulating the Earth's climate. It absorbs and reflects solar radiation, and it stores and releases heat.
(vi) Protects the Earth from harmful radiation: The surface layer of the Earth's crust provides protection from harmful radiation from the sun and other sources. It absorbs and scatters this radiation, reducing its impact on the Earth's surface.
•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•
(3ai)
Mode Of Formation: Igneous rocks are formed by the cooling and solidification of molten rocks called magma, ejected from beneath the earth's crust. The magma which results from high temperature and pressure beneath the earth, forces itself towards the earth's surface through cracks. As the magma moves towards the surface, it comes in contact with lower temperature, hence it cools and solidifies to form Igneous Rocks. A very good example of them are Basalt and Granite.
(3aii)
(i) They are either acidic or basic.
(ii) They are usually hard and impervious.
(iii) They do not contain fossils.
(iv) They do not occur in layers, i.e. they are non-stratified rocks.
(v) Igneous Rocks are crystalline in structures, i.e. they contain crystals.
(vi) They vary in Colour (light or dark).
(3b)
{CHOOSE ANY BEST 4}
(i) Igneous rocks like granite, basalt, and gabbro are used as building materials for their strength and durability.
(ii) Igneous rocks like marble, quartz, and obsidian are used for decorative purposes, such as countertops, flooring, and sculptures.
(iii) Igneous rocks like pumice and basalt are used as abrasives for cleaning and polishing surfaces.
(iv) Igneous rocks are used as aggregate in concrete, asphalt, and road construction.
(v) Igneous rocks like granite and basalt are used as dimension stone for architectural purposes.
(3ai)
Mode Of Formation
(i) Igneous rocks are formed from the cooling and solidification of molten rock material (magma).
(ii) Magma is generated when rocks within the Earth's crust and mantle melt due to increased temperature and/or reduction in pressure.
(iii) Igneous rocks can form both above (extrusive) and below (intrusive) the Earth's surface.
(3aii)
Characteristics
(2a)
(i) Core: Innermost layer, about 3476km wide all round, consists largely of iron and nickel, divisible into inner and outer core, found in a molten state, reservoir of minerals to the other zones.
(ii) Mantle: middle layer, surrounds the core, about 2897km thick, composed of very dense rocks, rocks are rich in olivine basalt.
(iii) Crust: Lies above the mantle, outer layer, consists of granitic and basaltic rocks, varies in thickness from place to place , divisible into 2-sial and sima, forms soil, sustains life.
(2b)
(PICK ANY FOUR)
(i) Provides a habitat for plants and animals: The surface layer of the Earth's crust provides a stable and habitable environment for a wide range of organisms. It provides the necessary conditions for life, such as sunlight, water, and nutrients.
(ii) Source of minerals: The surface layer of the Earth's crust contains a variety of minerals that are essential for human activities. These minerals include metals, such as iron, copper, and gold, as well as non-metallic minerals, such as sand, gravel, and clay.
(iii) Source of water: The surface layer of the Earth's crust is home to a variety of water bodies, including oceans, lakes, rivers, and aquifers. These water bodies provide essential resources for human consumption, agriculture, and industry.
(iv) Supports human activities: The surface layer of the Earth's crust provides a stable foundation for human activities, such as agriculture, construction, and transportation. It also provides scenic beauty and recreational opportunities.
(v) Regulates the Earth's climate: The surface layer of the Earth's crust plays a role in regulating the Earth's climate. It absorbs and reflects solar radiation, and it stores and releases heat.
(vi) Protects the Earth from harmful radiation: The surface layer of the Earth's crust provides protection from harmful radiation from the sun and other sources. It absorbs and scatters this radiation, reducing its impact on the Earth's surface.
•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•=•
(3ai)
Mode Of Formation: Igneous rocks are formed by the cooling and solidification of molten rocks called magma, ejected from beneath the earth's crust. The magma which results from high temperature and pressure beneath the earth, forces itself towards the earth's surface through cracks. As the magma moves towards the surface, it comes in contact with lower temperature, hence it cools and solidifies to form Igneous Rocks. A very good example of them are Basalt and Granite.
(3aii)
(i) They are either acidic or basic.
(ii) They are usually hard and impervious.
(iii) They do not contain fossils.
(iv) They do not occur in layers, i.e. they are non-stratified rocks.
(v) Igneous Rocks are crystalline in structures, i.e. they contain crystals.
(vi) They vary in Colour (light or dark).
(3b)
{CHOOSE ANY BEST 4}
(i) Igneous rocks like granite, basalt, and gabbro are used as building materials for their strength and durability.
(ii) Igneous rocks like marble, quartz, and obsidian are used for decorative purposes, such as countertops, flooring, and sculptures.
(iii) Igneous rocks like pumice and basalt are used as abrasives for cleaning and polishing surfaces.
(iv) Igneous rocks are used as aggregate in concrete, asphalt, and road construction.
(v) Igneous rocks like granite and basalt are used as dimension stone for architectural purposes.
(3ai)
Mode Of Formation
(i) Igneous rocks are formed from the cooling and solidification of molten rock material (magma).
(ii) Magma is generated when rocks within the Earth's crust and mantle melt due to increased temperature and/or reduction in pressure.
(iii) Igneous rocks can form both above (extrusive) and below (intrusive) the Earth's surface.
(3aii)
Characteristics
(i) Crystalline Structure: Igneous rocks have a crystalline structure, meaning they consist of visible interlocking crystals.
(ii) Grain Size: Extrusive igneous rocks generally have fine-grained crystals (less than 1mm), while intrusive igneous rocks have large crystals (more than 1mm) due to slower cooling.
(iii) Mineral Composition: The mineral composition of igneous rocks varies depending on the chemical composition of the magma. Common minerals include quartz, feldspar, and pyroxene.
(iv) Texture:The texture of igneous rocks describes the size, shape, and arrangement of crystals. It can be classified as porphyritic, aphanatic, aphanitic-porphyritic.
(v) Rock Type: Igneous rocks are classified based on their texture, grain size, and mineralogical composition.
(3b)
(PICK ANY FOUR)
(i) Construction: Igneous rocks, such as granite and basalt, are widely used as building materials for monuments, roads, and buildings due to their strength and durability.
(ii) Ornamental purposes: Igneous rocks with attractive colors and textures, such as marble and granite, are used for countertops, flooring, and decorative objects.
(iii) Industrial applications: Some igneous rocks, such as limestone, are used in the production of cement and lime.
(iv) Scientific study: Igneous rocks provide valuable insights into the composition and history of the Earth's crust and mantle. They are studied by geologists to understand plate tectonics, volcanic activity, and the formation of minerals.
(v) Road construction: Crushed igneous rocks, such as basalt, are used as aggregate in road construction due to their high strength and resistance to wear and tear.
(vi) Jewelry: Certain igneous rocks, such as obsidian, are used to make jewelry and decorative items due to their unique appearance and glassy texture.
(ii) Grain Size: Extrusive igneous rocks generally have fine-grained crystals (less than 1mm), while intrusive igneous rocks have large crystals (more than 1mm) due to slower cooling.
(iii) Mineral Composition: The mineral composition of igneous rocks varies depending on the chemical composition of the magma. Common minerals include quartz, feldspar, and pyroxene.
(iv) Texture:The texture of igneous rocks describes the size, shape, and arrangement of crystals. It can be classified as porphyritic, aphanatic, aphanitic-porphyritic.
(v) Rock Type: Igneous rocks are classified based on their texture, grain size, and mineralogical composition.
(3b)
(PICK ANY FOUR)
(i) Construction: Igneous rocks, such as granite and basalt, are widely used as building materials for monuments, roads, and buildings due to their strength and durability.
(ii) Ornamental purposes: Igneous rocks with attractive colors and textures, such as marble and granite, are used for countertops, flooring, and decorative objects.
(iii) Industrial applications: Some igneous rocks, such as limestone, are used in the production of cement and lime.
(iv) Scientific study: Igneous rocks provide valuable insights into the composition and history of the Earth's crust and mantle. They are studied by geologists to understand plate tectonics, volcanic activity, and the formation of minerals.
(v) Road construction: Crushed igneous rocks, such as basalt, are used as aggregate in road construction due to their high strength and resistance to wear and tear.
(vi) Jewelry: Certain igneous rocks, such as obsidian, are used to make jewelry and decorative items due to their unique appearance and glassy texture.
Geo Obj-
01
11CADECEBDCD
21BDCADCCAAA
31ADDBDACCBE
41BACDACDAEC
51ABBEEDBDDB
01
11CADECEBDCD
21BDCADCCAAA
31ADDBDACCBE
41BACDACDAEC
51ABBEEDBDDB