(6) Which of the following is know as black gold ?
A. coke B. petroleum C. petrol D. Coal
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actually it will be petroleum crude oil
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Answer:
B. Petroluem
Petroluem is known as black gold as it is black coloured crude oil that is extracted from earth's crust and it has its value as it is limited in stock, takes millions of years to form and is costly available.
Explanation:
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