state the physical features of coal
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black and no perfect shape burns easily to hot temperature.
it produce carbon monoxide on burning.
more burnt more efficiently.
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Coal is a sedimentary rock formed in wide, low-lying equatorial swamps crossed by large rivers and covered by forests of primitive trees. Here, the remains of trees and plants were saved from biodegration and oxidation by mud and water. Coal is usually black in colour but sometimes it occurs as a brownish-black colour.
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