why petroleum is called as black gold
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Why the Phrase 'Black Gold'? This is because when crude oil is extracted from the land it is black in color. This resource is compared to gold due to its valuable properties and worth too. ... Crude oil is jet black before purification but after purification, it turns golden in color; therefore, it's tagged as Gold
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This is bcz of cured oil extracted from the land and it is black in colour
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