1. 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?
Answers
(I) The three layers of the Earth are the crust, the mantle and the core.
(ii) A rock refers to any natural mass of mineral matter that makes up the Earth’s crust.
(iii) Igneous, sedimentary and metamorphic rocks are the three types of rocks.
(iv) Extrusive rocks are formed when the molten magma present inside the Earth’s interior comes out onto the Earth’s surface, cools down and becomes solid. When molten magma cools down and solidifies deep within the Earth’s crust, intrusive rocks are formed.
(v)The transformation of one type of rock into another, under certain conditions and in a cyclical manner is referred to as the rock cycle
(vi) Some of the uses of rocks are as follows:
(a) For building roads, houses and buildings
(b) For making jewellery
(c) For cutting and drilling purposes
(vii) Metamorphic rocks are the rocks that get formed under great heat and pressure.
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