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When plants such as trees died they would fall into swamps or other forms of water. With the lack of oxygen under these conditions the plants could not decay, they instead formed a layer of peat. As time went on the movement of water brought sediments in which covered the peat, gradually pushing it down. As it got deeper the heat and pressure turned it into a lignite, or soft brown coal. As more time went on and more sediment was laid on top of it the temperature and pressure further increased therefore turning it into black bituminous coal.

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13y ago

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