What are the different types of coals ?
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Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
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Explanation:
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.
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