Fuels formed in the Earth’s crust over millions of years from decomposed organic matter. The most widely known fossil fuels are petroleum (oil), coal, and natural gas.
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http://needtoknow.nas.edu/energy/glossary/
Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale. For further information see Fuel Chemistry
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http://www.chemistry-dictionary.com/definition/fossil+fuels.php
Carbon or hydrocarbon fuels, derived from what was living material, and found underground or beneath the sea. The most common forms are coal, oil and natural gas. They take millions of years to form. Their energy is only released upon burning, when the carbon and hydrogen within them combine with th...
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http://www.daviddarling.info/encyclopedia/F/AE_fossil_fuels.html
Coal, oil and gas - all fuels that were formed from the remains of dead plants and animals.
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http://www.encyclo.co.uk/local/20442
Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale. For further information see Fuel Chemistry
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http://www.encyclo.co.uk/local/20728
Any hydrocarbon deposit that may be used for fuel. Examples are petroleum, coal, and natural gas. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
Coal, oil, petroleum, and natural gas and other hydrocarbons are called fossil fuels because they are made of fossilized, carbon-rich plant and animal remains. These remains were buried in sediments and compressed over geologic time, slowly being converted to fuel.
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http://www.encyclo.co.uk/local/21291
Carbon based compounds such as coal, oil and gas formed over millions of years.
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http://www.encyclo.co.uk/visitor-contributions.php
Includes coal, oil, and natural gas. Fossil fuels are derived from prehistoric plant and animal materials that were exposed to high temperatures and pressure.
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http://www.encyclo.co.uk/visitor-contributions.php
fuels like coal, gas and oil formed in the Earth's geographical past
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http://www.encyclo.co.uk/visitor-contributions.php
coal, oil, and natural gas, which come from the remains of ancient plants and animals over millions of years
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https://sciencetrek.org/sciencetrek/topics/climate/glossary.cfm
a natural fuel such as coal or gas, formed in the past from the remains of living organisms.
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https://sciencetrek.org/sciencetrek/topics/sun/glossary.cfm
Elements like coal, oil and natural gas. They are known as fossil fuels as they are formed from organic chemicals, those that were once living matter.
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https://www.encyclo.co.uk/local/20501
Oil, natural gas and coal â€` formed in the ground from the remains of dead plants and animals over millions of years.
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https://www.encyclo.co.uk/local/20639
Coal, Oil and Gas are called 'fossil fuels' because they have been formed from the fossilised remains of prehistoric plants and animals. They provide around 66% of the world's electrical power, and 95% of the world's total energy demands (including heating, transport, electricity generation and other uses).
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https://www.encyclo.co.uk/local/20849
Fuels such as coal, oil and gas made by decomposition of ancient animal and plant remains which give of carbon dioxide when burned.
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https://www.encyclo.co.uk/local/20855
Fuels that are formed in the Earth from plant or animal remains; e.g., coal, petroleum, and natural gas.
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https://www.encyclo.co.uk/local/21571
Fuels formed in the ground from the remains of dead plants and animals. It takes millions of years to form fossil fuels. Oil, natural gas, and coal are fossil fuels.
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https://www.encyclo.co.uk/local/22819
Coal, oil and natural gas; this term applies to any fuels formed from the fossil remains of organic materials (plants and animals) that have been buried for millions of years
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https://www.encyclo.co.uk/local/22828
Fuels such as coal, oil and petroleum that are derived from fossilised organic matter.
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https://www.encyclo.co.uk/local/22829
Energy sources formed by the decay of plants, dinosaurs and other animals over millions of years; coal, oil and natural gas are fossil fuels.
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https://www.encyclo.co.uk/local/22830
Any natural occurring organic fuel formed in the Earths crust such as coal, oil and natural gas. Carbon dioxide and other greenhouse gases are generated by burning fossil fuels and they are non renewable.
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https://www.encyclo.co.uk/local/22834
A stored energy source, originally of organic (living) origin, that can be used as a fuel; includes coal, oil, natural gas, and peat.
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https://www.encyclo.co.uk/local/23001
Fossil fuels are formed from the fossilized remains of dead plants by exposure to heat and pressure in the Earth's crust (or by natural processes such as anaerobic decomposition) over millions of years. Thus fossil fuels are non-renewable resources.
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https://www.icore-solarfuels.org/
biomass lain down in the Earth millions of years ago, such as coal, oil, and natural gas, which when burnt produce carbon dioxide.
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https://www.metoffice.gov.uk/weather/climate-change/climate-glossary
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