Solution of Chapter 2. Inside our Earth (Our Environment Book)

Exercise

1

What are the three layers of the earth?
1

What is a rock?
1

Name three types of rocks.
1

How are extrusive and intrusive rocks formed?
1

What do you mean by a rock cycle?
1

What are the uses of rocks?
1

What are metamorphic rocks?
2

Tick the correct Answer.

The rock which is made up of molten magma is


(a) Igneous


(b) Sedimentary


(c) Metamorphic
2

Tick the correct Answer.

The innermost layer of the earth is


(a) Crust


(b) Core


(c) Mantle
2

Tick the correct Answer.

Gold, petroleum and coal are examples of


(a) Rocks


(b) Minerals


(c) Fossils
2

Tick the correct Answer.

Rocks which contain fossils are


(a) Sedimentary rocks


(b) Metamorphic rocks


(c) Igneous rocks
2

Tick the correct Answer.

The thinnest layer of the earth is


(a) Crust


(b) Mantle


(c) Core
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
4

Give reasons

We cannot go to the centre of the earth.
4

Give reasons

Sedimentary rocks are formed from sediments.
4

Give reasons

Limestone is changed into marble.
5

For fun.

What are the minerals most commonly used in the following objects?
5

For fun.

Identify some more objects made up of different minerals.