Question

how do coal vary from each other

Answer 1

The four types of coal include peat, lignite, bituminous, and anthracite, with anthracite being most desirable due to its high heat content. Coal was formed millions of years ago during the Carboniferous Period from ancient plants found in swamps and bogs.

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Answer 2

on the bases of carbon ,coal is classified into four types:
1.PEAT
2.LIGNITE
3.BITUMINOUS COAL
4.ANTHRACITE COAL