Why are coal, oil, and natural gas considered fossil fuels?

Question

A
They are flammable and release energy when burned

B
They are used for transportation and electricity generation

C
They are energy sources made from the remains of ancient organisms

D
They are made from the remains of organisms recently buried by glaciers

Answer 1

C. They are energy sources made from the remains of ancient organisms.

Fossil fuels like coal, oil, and natural gas are formed from the decomposed remains of plants and animals that lived millions of years ago. These organic materials were subjected to heat and pressure over time, transforming them into the fossil fuels we use today.