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2015-10-01T07:57:17+05:30
Natural petroleum is black in colour. in today's world it it worth its weight in gold .due to such importance it is called black gold

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2015-10-01T10:10:55+05:30

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natural petroleum is referred to as black because it is black in color.and gold because it is as precious as gold. 
                      i hope that this will help u.
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