Question

Coal, petroleum and natural gas are called _____ fuels.

Answer 1

The action of nature over millions of years converts the fossils of plants and animals into fuels such as coal, petroleum, and natural gas. These gases are called fossil fuels.

Fossil fuels are fuels preserved in the earth's crust, which are formed over millions of years from the remains of plants and animals.

Concluding statement

Coal, petroleum and natural gas are called fossil fuels.