3. The main component of fossil fuels is
Korosong
4. The gas obtained by fractional distillation of petroleum is called
5.
is obtained along with petroleum in the oil wells.
6.
is the process of conversion of dead and buried trees into coal
7. Excessive burning of fossil fuels increases levels of
in the air,
leading to
8. The chemical substances obtained from petroleum are called
9. The product of petroleum that is used to make the surface of roads is
10.
is used as a fuel for jet aeroplanes.
Answers
Introduction
We use various materials for our basic needs. Some of them are found in nature and some have been made by human efforts.
Natural resources
Definition
The sources which are obtained from nature are called natural resources.
Types of natural resources
1. Inexhaustible natural resources
These sources are present in unlimited quantity in nature and are not likely to be exhausted by human activities.
Examples: Sunlight, air, etc.
2. Exhaustible natural resources
The amount of these resources in nature is limited, they can be exhausted by human activities.
Examples: Forests, coal, petroleum. minerals, wild life, natural gas, etc.
Booster 1
Can sunlight get exhausted by human activities?
Explanation
Sunlight is an ultimate source of energy available free of cost. It cannot be exhausted by human activities as it is produced by a natural process of fusion inside the sun. Due to this nuclear fusion extremely large amount of energy is produced which comes in the form of sunlight.