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fossil fuel


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Any naturally occurring carbon-containing material which when burned with air (or oxygen) produces (directly) heat or (indirectly) energy. Fossil fuels can be classified according to their respective forms at ambient conditions. Thus, there are solid fuels (coals); liquid fuels (petroleum, heavy oils, bitumens); and gaseous fuels (natural gas, which is usually a mixture of methane, CH4, with lesser amounts of ethane, C2H6, hydrogen sulfide, H2S, and numerous other constituents in small proportions).
Usage: an example of fossil fuel is gasoline,oil,coal,and petroleum

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