Chapter 5 Coal and Petroleum

  • The resources which we get from nature are called as natural resources.
  • Natural resources are of two types: Inexhaustible natural resources and exhaustible natural resources.
  • The resources which are present in the unlimited quantity in nature are called as inexhaustible natural resources. For example: sunlight.
  • The resources which are present in the limited quantity in nature are known as exhaustible natural resources. For example: coal, petroleum.
  • Fossil fuel may be defined as the fuels which are formed from the dead vegetation and dead remaining of living organisms. They are present in limited quantity.
  • Coke is the pure form of carbon, it is used in the manufacture of steel.
  • Coal is as hard as stone, it is used to cook food.
  • A thick, black liquid with unpleasant smell is called as coal tar.
  • Petrol and diesel are obtained from the natural resources are called as petroleum.
  • The process of separating the various constituents of petroleum is known as refinery.
  • CNG and LPG are the clean fuels which does not produce and harmful gas behind.
  • We should use the inexhaustible natural resources.
  • We should use the exhaustible natural resources carefully because they are limited in nature.

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Exercise 1 ( Page No. : 63 )

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