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NCERT Solutions for Class 7 Social Science Geography Chapter 2 - Inside Our Earth

Download the NCERT Solutions for Class 7 Geography Chapter 2 - Inside Our Earth here in PDF format. Prepare for your exams with the best study material provided here.

Jun 29, 2020 19:39 IST
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NCERT Solutions for Class 7 Social Science Geography Chapter 2 - Inside Our Earth
NCERT Solutions for Class 7 Social Science Geography Chapter 2 - Inside Our Earth

NCERT Solutions for Class 7 Social Science Geography Chapter 2 - Inside Our Earth are best to clearly understand all the concepts. All the answers have been kept simple and concise so that students can easily learn them and make effective preparations for their exams. We have provided here the NCERT solutions for the exercise questions given at the end of chapter 2 of the latest NCERT Book for Class 7 Geography . Students should read only the NCERT Solutions provided by Jagran Josh to get the latest study material. You can read and download all the questions and answers in PDF format.

NCERT Solutions for Class 7 Social Science Geography Chapter 2 - Inside Our Earth:

Exercises

1. Answer the following questions.

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

Answer:

The three layers of earth are:

(i) Crust

(ii) Mantle

(iii) Core

(ii) What is a rock?

Answer: 

Any natural mass of mineral matter that makes up the earth’s crust is called a rock.

(iii) Name three types of rocks.

Answer: 

The three types of rocks are:

(i) Igneous Rocks

(ii) Sedimentary Rocks

(iii) Metamorphic Rocks

(iv) How are extrusive and intrusive rocks formed?

Answer: 

Extrusive rocks are formed by the molten lava which comes out of volcanoes, reaches the earth’s surface and cools down rapidly to become a solid piece of rock. For example, basalt.

When the molten magma cools down deep inside the earth’s crust, the solid 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, under specific conditions and in a cyclic manner, is called a rock cycle. For example, when the molten magma cools; it solidifies to become igneous rock. These igneous rocks are broken down into small particles that are transported and deposited to form sedimentary rocks. When the igneous and sedimentary rocks are subjected to heat and pressure they change into metamorphic rocks. The metamorphic rocks which are still under great heat and pressure melt down to form molten magma. This molten magma again can cool down and solidify into igneous rocks.

(vi) What are the uses of rocks?

Answer: 

Various uses of rocks are:

(i) Hard rocks are used in the construction of roads, houses and buildings.

(ii) Shiny and precious rocks are used for making jewellery.

(iii) Some rocks are used for cutting and drilling purposes.

(iv) The mineral constituents of rocks are used in making medicines and fertilisers.

(v) Some of the rocks are used as fuels. For example, coal, natural gas and petroleum.

(vi) Small stones are used by children in different types of games. For example, seven stones (pitthoo), hopscotch (stapu/kit kit), five stones (gitti).

(vii) Soft rocks are used for making talcum powder, chalks, etc.

(vii) What are metamorphic rocks?

Answer: 

The type of rocks formed when igneous and sedimentary rocks are subjected to heat and pressure are called metamorphic rocks.

Also Read:

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Class 7 Maths NCERT Solutions

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Class 7 Science NCERT Solutions

2. Tick the correct answer.

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

(a) Igneous

(b) Sedimentary

(c) Metamorphic

Answer: (a) Igneous

(ii) The innermost layer of the earth is

(a) Crust

(b) Core

(c) Mantle

Answer: (b) Core

(iii) Gold, petroleum and coal are examples of

(a) Rocks

(b) Minerals

(c) Fossils

Answer: (b) Minerals

(iv) Rocks which contain fossils are

(a) Sedimentary rocks

(b) Metamorphic rocks

(c) Igneous rocks

Answer: (a) Sedimentary rocks

(v) The thinnest layer of the earth is

(a) Crust

(b) Mantle

(c) Core

Answer: (a) Crust

3. 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 definite chemical composition

(v) Sial

(e) Innermost layer

 

(f) Changes into slate

 

(g) Process of transformation of the rock Rocks

Answer:

(i) Core

(e) Innermost layer

(ii) Minerals

(d) Has 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

4. Give reasons.


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

Answer:

To reach the centre of the earth one will have to dig a hole 6000 km. deep on the ocean floor which is an impossible task. Therefore we cannot go to the centre of the earth. Moreover, the temperature and pressure at the centre of the earth are too high to bear.

(ii) Sedimentary rocks are formed from sediments.

Answer:

Rocks break down into small fragments known as sediments. These sediments are transported and deposited by wind, water, etc. These loose sediments tend to compress and harden over time to form layers of rocks known as sedimentary rocks.

(iii) Limestone is changed into marble

Answer:

Igneous and sedimentary rocks change into metamorphic rocks under heat and pressure. Now, limestone is a type of sedimentary rock that under heat and pressure changes into marble which is a metamorphic rock.

Download all the NCERT Solutions for Class 7 Geography Chapter 2 from the following link:

NCERT Solutions for Class 7 Geography Chapter 2 - Inside Our Earth

 

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