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■ STAGES OF COAL FORMATION. ◇ In the process of transformat | UPSC.Geography Economy Notes

■ STAGES OF COAL FORMATION.



◇ In the process of transformation (coalification),

1. Buried plants turn into peat,

2. Peat is altered to lignite,

3. lignite is altered to sub-bituminous,

4. sub-bituminous coal is altered to bituminous coal, and

5. bituminous coal is altered to anthracite (oldest, best quality coal).

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