Chapter : 4 COAL AND PETROLEUM Natural Resources: Natural Resources: Resources include everything provide by the nature. They form the wealth of a country.Types of Natural Resources: Inexhaustible: There are some resources that are present unlimited in nature and will not be exhausted even if used continuously.Ex: Sunlight, Air.(ii) Exhaustible: These resources are limited and can soon get exhausted because of their excessive use.Ex: Forests, wildlife, minerals, coal, petroleum, etc. Fossil fuels Fossil fuels were formed from the dead remains of living organisms millions of years ago.Fossil fuels are exhaustible resources.Coal, petroleum and natural gas are fossil fuels.