Lignite Subbituminous Bituminous Anthracite

2019129the coal formation process involves the burial of peat, which is made of partly decayed plant materials, deep undergroundhe heat and pressure of burial alters the texture and increases the carbon content of the peat, which transforms it into coal, a type of sedimentary rockhis process takes millions of yearsypes, or ranks, of coal are determined by carbon content.

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