What is mean by Coal ?
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Answered by
30
Answer:
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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Answered by
32
Step-by-step explanation:
Coal is a hard black substance that is extracted from the ground and burned as fuel. Gas-fired electricity is cheaper than coal. Today, oil and natural gas have replaced coal and wood in most areas.
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