A fossil fuel is a fuel, such as coal, oil, and natural gas, produced by the Decomposition of ancient (fossilized) plants and animals; compare to alternative energy.
Other /More definition:
A Fossil Fuel is a substance found beneath the Earth's surface that can be used as a source of energy. Petroleum (which is often used to make plastic), natural gas, and coal are fossil fuels.

-See also:
"Fossil Fuel" is in the NAICS Code "221112"
(Fossil Fuel Electric Power GenerationFossil Fuel Electric Power Generation)


Other /More definition:
A Fossil fuel is a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years. See coal, petroleum, crude oil, natural gas.
Other /More definition:
Fossil fuel is the products of partial or complete decomposition of plants and animals that occur as crude oil, coal, natural gas, or heavy oils as a result of exposure to heat and pressure in the earth"s crust over millions of years. See coal, crude oil, natural gas.

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