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why are coal and petroleum called fossil fuels

The remains of the pre-historic animals or plants buried under the earth millions of years ago are called fossils. Coal and petroleum are knowm as fossil fuels because they were formed by the decomposition of remains of pre historic plants and animals buried under the earth long, long ago.

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 Coal and petroleum are called fossil fuel because they are non renewable natural resources (Both have an organic origin and are called hydrocarbon fuels).

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They get extinted anyday just like endangered species.

approximately 40 years.

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 because it take thousand years in their formation 

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They are called so because they are formed from dead and decaying plants and animals which is otherwise called as fosils

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