Explain why coal oil and natural gas are fossil fuels?

Answer 1

They have been formed over millions of years as dead animals and plants have been crushed and compressed by the weight of the ever-increasing material on top of them. Their age, along with the fact that they are unrenewable sources i.e. they will never be re-made, leads to the fact that they are fossil fuels.

Answer 2

Coal, oil, and natural gas are considered fossil fuels because they are formed from the remains of ancient plants and animals that were buried and subjected to high pressure and heat over millions of years. This process preserved the organic matter in these substances, which now provide energy when burned.