Ch – 2 Inside Our Earth (Q-A)

Q: Answer the following questions:

a) What are the three layers of the earth ?

Ans: The three layers of the earth are: Crust, Mantle and Core.

b) What is a rock ?

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

c) Name three types of rocks.

Ans: Igneous, Sedimentary and Metamorphic.

d) How are extrusive and intrusive rocks formed ?

Ans: Extrusive rocks: When the molten magma comes on the earth’s surface, it rapidly cools down and becomes solid. Rocks formed in such a way on the crust are known as Extrusive rocks.

Intrusive rocks: The intrusive rocks are formed when molten magma cools down deep inside the earth’s crust.

e) What do you mean by a rock cycle ?

Ans: The process of transformation of the rock from one to another is known as a rock cycle.

f) What are the uses of rocks ?

Ans: Rocks are very useful to us. The hard rocks are used for making roads, houses and buildings. Children use rocks to play different games.

g) What are metamorphic rocks ?

Ans: When the igneous and sedimentary rocks undergo great heat and pressure, they change into metamorphic rocks.

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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