Why petroleum is known as black gold ?
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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.
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Many useful substances are obtained from petroleum. These are used in the manufacture of detergents, fibres (polyester, nylon, acrylic, etc.) Polythene and other plastic substances. Due to its great commercial importance petroleum is also called "black gold"
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