Question

why is petroleum called black gold​

Answer 1

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Petroleum is called black gold because when crude oil is extracted from the land it is black in color.Crude oil is jet black before purification but after purification, it turns golden in color; therefore, it's tagged as Gold.

Answer 2

Petroleum is called black gold because when crude oil is extracted from the land it is black in color.Crude oil is jet black before purification but after purification, it turns golden in color; therefore, it's tagged as Gold.