Coal is obtained by:

carbonization

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refining

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decomposition of dead aquatic animals

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none of above

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Solution

The correct option is D decomposition of dead aquatic animals
The slow process of conversion of dead vegetation into coal is called carbonization. Refining is the process of purifying any substance. Petroleum is obtained by the decomposition of dead aquatic animals. Thus coal is obtained by the process of carbonization. Hence option A is correct.

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