Answer:
Coal
is formed due to the compression of plant material over millions of years.
The four forms found in India are
(i) Peat has high moisture content and low heating capacity.
(ii) Lignite is a low grade brown coal, soft and with high
moisture content.
(iii) Bituminous coal is buried deep and subject to high temperature.
It has good heating power and is usually black in colour.
(iv) Anthracite coal is the hardest variety and has the highest
heating power.
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