what is coal? answer the question
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Step-by-step explanation:
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
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Step-by-step explanation:
Coal is a naturally occurring black material which is a mixture of carbon and compounds of carbon-containing hydrogen, nitrogen, oxygen and sulphur. It is a major source of energy.
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