Millions of years ago, dead plants and animals fall into seas and swamps
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As they died organisms and tress fell to the bottom of these swamps and oceans where they decomposed. Over millions of years they were buried under layers upon layers of mud
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The plant and animal remains eventually forms coal far underground.
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Coal is then mined from coal deposits that were found from mining underground
The coal is then used for various purposes such as a source of electricity or a fuel for a fire to heat up a cold night..
Natural gas and crude oil formed in the same way and it is used for heating, cooking, and cooking, and electricity generation.