Answers

2015-10-04T22:18:09+05:30
Coal is known as black gold.this is because it is generally black in color and like gold it is widely used for various purpose and contributes a lot to mankind

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It is a term applied to oil or petroleum, which is black when it comes out of the ground and is worth a great deal of money :)
2015-10-06T16:53:19+05:30
Coal is known as black gold because it is black in color and like gold it is very much precious.
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