NCERT Solution For Class 7 Geography, Chapter 2 – Inside our earth

NCERT Geography class 7 is known as an extremely helpful resource for preparing for the exam. Takshila Learning provides its learners with access to a wealth of NCERT problems of class 7 geography chapter 2 and their solutions. CBSE Class 7 Geography Inside our earth NCERT Solutions are built by subject matter experts, so be sure to train learners for a good grade. The questions set out in the NCERT

NCERT Solution For Class 7 Geography – Inside our earth provides us with all-inclusive information on all concepts. As students would have to learn the basics about the subject in class 7 geography chapter 2, this curriculum for NCERT Geography class 7 is comprehensive study material, which explains the concepts in a great way.

Q 1. Answer the following questions.

(i) What are the three layers of the earth?

Answer: the three layers of earth are :

1. Crust
2. Mantle
3. Core

(ii) What is a rock?

Answer: 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 texture, size and colour.

(iii) Name three types of rocks.

Answer: the three types of rocks are:

1. Igneous Rocks
2. Sedimentary Rocks
3. Metamorphic Rocks

(iv) How are extrusive and intrusive rocks formed?

Answer: 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) What do you mean by a rock cycle?

Answer: 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) What are the uses of rocks?

Answer: Rocks are useful for various purposes:

1. It helps in making roads
2. It is used in the construction of houses and buildings
3. Small stones are used by children in different types of games
4. They are used in fertilisers

(vii) What are metamorphic rocks?

Answer: The type of rocks formed when igneous and sedimentary rocks experience heat and pressure are called metamorphic rocks.

Q 2. Tick the correct answer.

(i) The rock which is made up of molten magma is

(a) Igneous

(b) Sedimentary

(c) Metamorphic

Answer: a

(ii) The innermost layer of the earth is

(a) Crust

(b) Core

(c) Mantle

Answer: b

(iii) Gold, petroleum and coal are examples of

(a) Rocks

(b) Minerals

(c) Fossils

Answer: b

(iv) Rocks which contain fossils are

(a) Sedimentary rocks

(b) Metamorphic rocks

(c) Igneous rocks

Answer: a

(v) The thinnest layer of the earth is

(a) Crust

(b) Mantle

(c) Core

Answer: a

Q 3. Match the following.

Answer:

Q 4. Give reasons.

(i) We cannot go to the centre of the earth.

Answer: 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) Sedimentary rocks are formed from sediments.

Answer: 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 are compressed and hardened to form a layer of rocks called the sedimentary rocks. This shows that sedimentary rocks are formed from sediments.

(iii) Limestone is changed into marble

Answer: 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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