fossil fuel
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Fossil Fuel 
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Combustible material, such as coal, lignite, oil, peat, and natural gas, formed from the fossilized remains of plants that lived hundreds of millions of years ago. Such fuels are non-renewable resources – once they are burnt, they cannot be replaced.
Fossil fuels are hydrocarbons (they contain atoms of carbon and hydrogen). They generate large quantities of heat when they burn in air, a process known as combustion. In this process carbon and hydrogen combine with oxygen in the air to form carbon dioxide, water vapour, and heat.
© RM 2009. Helicon Publishing is division of RM.
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