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| Fossil Fuels |
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| Fossil fuels are energy-rich, combustible forms of carbon or compounds of carbon formed by the decomposition of biomass buried under the Earth over millions of years. |
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 Natural gas |
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 Coal |
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 Petroleum |
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| Fossil fuels are non-renewable and the source of their energy is Sun.
The energy from Sun is trapped and stored as chemical energy in plants (and then transferred to animals) is ultimately released as heat and light energy by the fossil fuels on burning. |
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 It is believed that plants and animals that died due to various natural calamities like cyclones, floods, forest fires, earthquakes etc., got buried under soil sediments over a period of millions of years. |
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 The remnants of buried plant and animal matter (organic) got subjected to the action of anaerobic bacterial
decomposition, at high pressure, temperature, absence of oxygen etc., under the
surface of the Earth. |
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 Due to the above conditions the trapped organic matter got gradually decomposed to coal, petroleum and natural gas. |
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