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The formation of coal is explained by ________

(a) ex-situ theory

(b) in-situ theory

(c) molecular theory

(d) nuclear theory

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The correct answer is (b) in-situ theory

For explanation: The in-situ theory explains the formation of coal. It is also explained by drift theory. According to in-situ theory, the coal is formed only at the places where vegetation grew.

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