Question

why is petroleum called black gold ​but not silver or brass or copper or platinum

Answer 1

Answer:

bcoz Petroleum even the tiniest part is not waste as it is very cheap

Answer 2

Answer:

Petroleum is referred to as Black Gold. ... When the petroleum is drilled from the ground in the liquid form, it is referred to as crude oil. This name black gold itself is an indication that it is very vital to humans. Because of its oil and worth, people refer to it gold

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