Fossil fuel | Meaning, Types, & Uses | Britannica
5 · An oil well pumpjack. fossil fuel, any of a class of hydrocarbon -containing materials of biological origin occurring within Earth''s crust that can be used as a source of energy. Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. All contain carbon and were formed as a result of geologic ...
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