Question

Why petroleum is called black gold?​

Answer 1

Answer:

Petroleum is called as black gold, because it's value is very high and it's black in colour in its crude form. Thus, it's called as black gold. Petroleum is formed from the fossils of sea animals, hence a fossil fuel.

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Answer 2

Answer:

Petroleum is referred to as 'black gold' because when crude oil is extracted from the land it is black in colour. People call it gold because of its oils and value. It is very difficult to find.