Choose one term from the following which include all others:coal, natural gas, fossil fuels, petroleum

Fossil fuels are the natural fuels that are found deep inside the earth and are formed from the prehistoric remains of the organisms.

The plants and animals which died millions of years ago got buried deep inside the earth, in the absence of oxygen got converted into fossil fuels such as coal, petroleum and natural gas, due to the chemical effects of bacteria along with continuous pressure and heat. The buried remains of large plants get converted into coal and the remains of small plants and animals into petroleum and natural gas.]