Answers

2015-10-18T19:03:12+05:30
Petroleum and its derivatives are called liquid gold or black gold as they are very valuable.
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2015-10-18T19:15:38+05:30
Petroleum is called as liquid gold because it a non-renewable, and it is a most valuable, and useful one. Also, it is quiet costly, which will be more and more costly in the upcoming years.
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