Question

please help me to make mind map on chapter coal and petroleum of science class 8 I promise to mark as brainlist

Answer 1

about coal and petroleum both are from earth to make fire

Answer 2

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.


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