1. Answer the following questions.
(i) What are the three layers of the earth?
(ii) What is a rock?
(iii) Name t


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?

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Caroline 4 months 2021-07-19T00:05:16+00:00 2 Answers 0 views 0

Answers ( )




    (i) Ans. The three layers of the earth are

    1. Crust

    2. Mantle (picture 1)

    3. Core

    (ii) Ans. Any natural mass of solid mineral matter that makes up the Earth’s crust is called rock.

    (iii) Ans. The three types of rock are –

    1. Igneous rocks

    2. Sedimentary rocks

    3. Metamorphic rocks

    (iv) Ans. Extrusive rocks are formed by the molten lava which comes on the surface of the earth and rapidly cools down to becomes solid. When the molten magma cools down deeps inside the Earth’s crust then the solid rock are formed are called intrusive rocks.

    (v) Ans. When one type of rock changes to another type under certain conditions in a cyclic manner then this process of transformation of the rock from one to another is known as the Rock Cycle (Picture 2)

    (vi) Ans. The uses of the rock are as follows:

    • Rocks are used in construction of buildings and roads.
    • Rocks are used for making medicines.
    • Rocks are used for making fertilizers.
    • Soft rock are used for making talcum powder, chalks etc.

    (vii) Ans. The rock which are formed due to conversion of igneous and sedimentary rocks under great heat and pressure is called metamorphic rocks.


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    1-Crust ,Mantle,core

    2-Rock is a mixtures of soil and minerals

    3- Igneous, Metamorphic, Sedimentary

    4- Extrusive rocks formed on outside earth’s surface and intrusive rocks formed inside the rock surface.

    5- Rock cycle is a cycle in which rocks melts and become lava and then cool and then again become rock.

    6-Rocks are used in Making home , monument, structure and many more.

    7-Metamorphic rocks are formed by cooling of lava .

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