Question

why petroleum is known as black gold?

Answer 1

petroleum is known as black gold because as gold is less or you can say precious in the world and have a particular limit in the world , petroleum is also having a limit in this world and is precious.so it is called black gold.
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Answer 2

Petroleum is known as black gold because when crude oil is extracted from the land it is black in colour.people called its gold because of its oils and value.

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