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Petroleum is also called _____.

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black diamond

liquid gold

yellow gold

black gold

answer is D.

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Detailed Solution

Petroleum is a fossil fuel, and when it is extracted from underground reservoirs, it is obtained as a black liquid.

Petroleum is equally valuable to gold, and its products are of great commercial importance.

Petrol, diesel, paraffin wax, and LPG are also obtained by refining petroleum, and they all are the fuels on which human life depends.

Hence, petroleum is also called black gold.

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