Petrol is called Black gold because when crude oil is extracted from the land it is black in colour. People called it as gold because of its oil and value of it. So it is called Black Gold...
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we have to put forth some questons for petroleum is a black gold
Petroleum is called as black gold because it has more economic value. It is used as a fuel for automobiles. During fractional distillation it can be divided into many forms like crude oil, Petrol, diesel,naphthalene.
The problem asks for questions and not why it is called so.....