The plant debris of swamps turned gradually into coal after buried and heated. The sequence of coal formation is:

a. Bituminous Peat Lignite
b. Peat LigniteBituminous
c. Peat Bituminous Lignite
d. LignitePeatBituminous


Answer: b. Peat LigniteBituminous

Environmental & Atmospheric Sciences

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Fill in the blank with correct word.

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