name and explain the four grades of coal
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The four types of coal are peat, lignite, bituminous, and anthracite. ... It's a very soft brown coal. Eventually over time, with increasing pressures and temperatures, peat is 'cooked' into coal's next stage, lignite. Lignite is a soft brown coal that still contains a high amount of water.
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peat,lignite,bituminious, and anthracite
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