Why are coal known as fossil fuel?

Answer 1

Coal is formed over millions of years by pressure and heat on decomposed vegetation accumulated in shallow swamps, the result is a sedimentary carbonaceous rock known as coal...

Answer 2

Coal is considered a fossil fuel because it is formed from the remains of plants and trees that lived millions of years ago. Over time, the organic matter accumulated and was subjected to heat and pressure, resulting in the formation of coal deposits. This process makes coal a non-renewable resource, as it takes millions of years to form.