CBSE Class 7 Social Science Inside Our Earth Worksheet Set B

Very Short Answer Type Questions

Question. How many types of rocks are found on the earth?
Answer : Basically, there are three types of rocks:-
1. Igneous
2. Sedimentary
3. Metamorphic

Question. By which name the innermost part of the earth called? What are the components of this part?
Answer : The innermost part of the earth is called ’Core’. The core known as NiFe, mainly consists of two elements Nickel (Ni) & Ferrous (Fe).
 

Short Answer Type Questions

Question. What are igneous rocks? How many types are there in these rocks? Write about the intrusive rocks.
Answer : ‘Igneous’ means fire.
These rock are of two types:-1. Intrusive 2.Extrusive
These rocks are formed out of the cooling of the hot and liquid material from the interior of the Earth.
Intrusive Igneous rocks: - Rocks formed by the cooling of the Magma, in the interior of the earth are called as Intrusive Rocks.

Question. Write about the metamorphic rocks, give specific example of these rocks.
Answer : As a result of the effect of temperature and pressure, igneous rocks and sedimentary rocks undergo a change in their form, structure and hardness. Such transformed rocks are called metamorphic rocks. Examples: - Marble, slate, coal etc.

Question. Which mineral is called as 'Liquid Gold'? Give brief introduction.
Answer : Petroleum is called as ‘Liquid Gold’. It is made out of the vegetation and animals trapped between layers of sedimentary rocks. It is refined in refineries before use.

INSIDE OUR EARTH

IV. OBSERVE THE DIAGRAMS AND FILL UP THE BLANKS

 

 

V. ANSWER THE FOLLOWING QUESTIONS IN TWO POINTS

 

1. Explain the mineral constituents of the Continental Crust and Oceanic Crust

 

2. What is a rock? What are the three different types of rocks?

 

3. What are igneous rocks?

 

4. Differentiate between extrusive and intrusive rocks

 

5. What are metamorphic rocks? Give examples

 

6. What are Minerals? What are the uses of minerals?

 

VI. ANSWER THE FOLLOWING QUESTIONS IN FOUR POINTS

 

7. How are Sedimentary rocks formed?

 

8. Explain the rock cycle

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