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Inside Our Earth

Question

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For fun.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.

Solution

(i)

Objects	Minerals most commonly used in them
Karhai	Iron, copper, stainless steel
Ornaments	Gold, silver
Lamp	Brass, silver, gold
Hammer	Iron, steel, lead, brass
Bell	Brass, silver, gold
Pan/Tava	Iron, steel, aluminium

Some More Questions From Inside Our Earth Chapter

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?

Tick the correct answer.
(i) The rock which is made up of molten magma is

(a) Igneous

(b) Sedimentary

(c) Metamorphic

(ii) The innermost layer of the Earth is

(a) Crust

(b) Core

(c) Mantle

(iii) Gold, petroleum and coal are examples of

(a) Rocks

(b) Minerals

(c) Fossils

(iv) Rocks which contain fossils are

(a) Sedimentary rocks

(b) Metamorphic rocks

(c) Igneous rocks

(v) The thinnest layer of the Earth is

(a) Crust

(b) Mantle

(c) Core

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

Give reasons.
(i) We cannot go to the centre of the Earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble.

For fun.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.

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