Question

How fossil fuels are formed?

Answer 1

1. Fossil fuels were formed by the decomposition and alteration of the remains of plants and animals over a time span of several million years.
2. The plants and animals which died millions of years ago were gradually buried deep in the earth and got covered with sediments like mud and sand, away from the reach of oxygen.
3. In the absence of oxygen, the chemical effects of pressure, heat, and bacteria converted the buried remains of large plants into fossil fuels like coal and the buried remains of small plants and animals into petroleum and natural gas.