(a) Anthracite coal. It is the hardest coal with a high carbon content and no volatile matter. It has the best heat value.
(b) Bituminous coal. This hard and compact coal with both moisture and volatile matter.
(c) Lignite coal is brown, has a woody appearance and high moisture content.
(d) Peat. It is a brownish and fibrous substance.
Faimus answered the question on April 19, 2018 at 13:41
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