12. What is liquid gold? Why is it called so?
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Petroleum is called 'Liquid Gold' since it is liquid and just like gold, it has a high commercial value. It is generally called so in order to imply its significance. It also serves directly or indirectly as a source for various organic products that are useful and essential for humans
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Petroleum is called 'liquid gold' since it is liquid and just like gold, it has a high commercial value.
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