Question

2. Which substances are called as black gold​

Answer 1

Answer:

Crude oil comes out of the ground as black, so it is called as black gold. Actually, any business which provides a lot of money . As both Coal & Petroleum handles lot of money so they called as Black Gold.

Explanation:

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Answer 2

Answer:

Explanation:

crude oil is called black gold because it is black and also very useful.

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