Petroleum is also known as Black Gold - because when crude oil is extracted from the land it is black in color. People call it gold because of its oils and value . It is very difficult to find.
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1Sehaj1
When petroleum is extracted in the form of crude oil it is black in colour and it is called black gold because of its economic value.......
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Petroleum is also known as Black Gold - because when crude oil is extracted from the land it is black in color. People call it gold because of its oils and value . It is very difficult to find.