petroleum is referred to as Black gold?
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The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. Petroleum is very expensive like gold. Comparing its high value with gold in terms of properties and moneywise; it is regarded as black gold.
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Petroleum is referred to as 'black gold' because when crude oil is extracted from the land it is black in colour. People call it gold because of its oils and value. It helps in vehicles to move and is non-renewable resource.
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