NCERT Solutions for Class 7 Geography Social Science Chapter 2 Inside Our Earth
The NCERT Solutions for Class 7 Geography Chapter 2 are available here in a downloadable PDF format at no cost. Our planet, Earth, experiences constant changes internally and externally. Its interior includes the crust, mantle, and core. The Earth's crust is composed of various rock types: igneous, sedimentary, and metamorphic. Minerals are naturally occurring substances with specific physical properties and distinct chemical compositions. These NCERT Solutions for Class 7 Geography offer reliable answers to textbook questions, serving as valuable reference material for students. With these accessible NCERT Solutions for Class 7 in PDF format, students can readily prepare for their upcoming exams. These solutions enable students to effectively tackle questions from NCERT textbooks, providing a strong understanding of subject concepts and laying the groundwork for their academic journey or higher studies.
NCERT Solutions for SST- Geography Inside Our Earth
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Inside Our Earth
Answer the following questions.
(i) What are the three layers of the earth?
(ii) What is a rock?
(iii) Name three types of rocks.
(iv) How are extrusive and intrusive rocks formed?
(v) What do you mean by a rock cycle?
(vi) What are the uses of rocks?
(vii) What are metamorphic rocks?
(i) The three layers of the earth are
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Crust
-
Mantle
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Core
(ii) Any natural mass of mineral matter that makes up the earth’s crust is called a rock. The earth’s crust is made up of various types of rocks of different textures, sizes and colours.
(iii) The three types of rocks are
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Igneous Rocks
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Sedimentary Rocks
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Metamorphic Rocks
(iv) The molten lava comes out of volcanoes, reaches the earth’s surface and cools down rapidly to become a solid piece of rock. This is how extrusive rocks are formed. For example, basalt.
When the molten lava solidifies deep inside the earth’s crust, the rocks so formed are called intrusive rocks. For example, granite.
(v) The process of transformation of rocks from one type to another due to changes in certain conditions in a cyclic manner is called a rock cycle.
(vi) Rocks are useful for various purposes, such as
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They help in making roads.
-
They are used in the construction of houses and buildings.
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Small stones are used by children in different types of games.
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They are used in fertilisers.
(vii) The type of rocks formed when igneous and sedimentary rocks experience heat and pressure are called metamorphic rocks.
Tick the correct answer.
(i) The rock, which is made up of molten magma, is
(a) Igneous
(b) Sedimentary
(c) Metamorphic
(ii) The innermost layer of the earth is
(a) Crust
(b) Core
(c) Mantle
(iii) Gold, petroleum and coal are examples of
(a) Rocks
(b) Minerals
(c) Fossils
(iv) Rocks which contain fossils are
(a) Sedimentary rocks
(b) Metamorphic rocks
(c) Igneous rocks
(v) The thinnest layer of the earth is
(a) Crust
(b) Mantle
(c) Core
(i) a
(ii) b
(iii) b
(iv) a
(v) a
Match the following.
|
(i) Core |
(a) Earth’s surface |
|
(ii) Minerals |
(b) Used for roads and buildings |
|
(iii) Rocks |
(c) Made of silicon and alumina |
|
(iv) Clay |
(d) Has a definite chemical composition |
|
(v) Sial |
(e) Innermost layer |
|
(f) Changes into slate |
|
|
(g) Process of transformation of the rock Rocks |
|
(i) Core |
(e) Innermost layer |
|
(ii) Minerals |
(d) Has a definite chemical composition |
|
(iii) Rocks |
(b) Used for roads and buildings |
|
(iv) Clay |
(f) Changes into slate |
|
(v) Sial |
(c) Made of silicon and alumina |
Give reasons.
(i) We cannot go to the centre of the earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble.
(i) We cannot go to the centre of the earth because the temperature and pressure at the centre of the earth are very high, and not just human beings but even rocks melt at the centre of the Earth.
(ii) The small fragments of rock that hit each other and break to reach the ground are called sediments. These sediments are transported and deposited by wind, water, etc., and then compressed and hardened to form a layer of rocks called sedimentary rocks. This shows that sedimentary rocks are formed from sediments.
(iii) Igneous and sedimentary rocks change into metamorphic rocks under heat and pressure. This happens in the case of limestone. Limestone, under heat and pressure, changes into marble, which is a metamorphic rock.
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