Answer:
Coal
is called a fossil fuel because it was formed from the remains of vegetation
that grew as long as 400 millions year ago.
The most important element in the plant material is carbon, which gives
coal most of its energy.
4 Coal fields in India are attributed to two main geological ages, namely
Gondwana period (200 million years in age) and in tertiary period deposits (55
million years in age). While Gondwana coal has high carbon content found in
Damodar Valley (Jharia, Ranigang and Bokaro), Godavari, Mahanadi, Son and
Wardha, Tertiary coal with comparatively low carbon content found in
North-Eastern satates of Meghalaya, Assam, Arunachal pradesh and Nagaland.
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