Answers

2016-01-15T20:35:48+05:30
Crude oil is very dark brown/black color and makes people lots of money, In the early days there was a rush to get it out of the ground just like the gold rush (except that the oil rush has not stopped) simple as that.
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2016-01-15T20:37:47+05:30
Petroleum is called liquid gold because of it value. There are lots of activities done with it like transportation etc. Their is no replica of this so...... n expensive n exhaustible too .
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