write paragraph on coal
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Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.
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Coal starts to develop by the decay of plants under moist but essentially sub aerial conditions. The usual environment for the initiation of a coal bed development is a swamp where plant material accumulates without a complete oxygenation.
This accumulated plant material is subjected to compression and removal of moisture and oxygen until a high grade of coal development takes place. As the plant material is exposed to high pressures and temperatures, the coal changes to a series of different grades forming different mineral assemblages.
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