Q23 of 36 Page 26

Write the characteristics and some important uses of coal.

Some characteristics of coal is it is black in colour and hard. Some important uses of coal are

a) It is used as a fuel in thermal power plants to produce electricity.


b) Used as a fuel for cooking.


c) Used to obtain products like coal tar, coke, coal gas.


d) Used as a fuel in many industries.


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21

Some natural resources are given in a box. Classify them into the exhaustible and inexhaustible natural resources.

air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen.

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Write two important uses of coke.

 24

Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?

 25

Fill in the blanks and complete the story.

About 300 million years ago the earth had dense ________ in low lying wetland areas. Due to natural processes, like ______, these forests got burried under the ________. As more ________ deposited over them, they were compressed. The ________ also rose as they sank deeper and deeper. Under high ________ and high ________, dead plants got slowly converted into coal.