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Question
Which material is called 'black gold' ? Why ?
Which material is called 'black gold' ? Why ?
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Solution
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.
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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