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petroleum is the proper term for what is underground. "Oil"
is a euphemism created back in the day when people were almost as ignorant as they are now.
Petroleum is natural, it is a combination of organic and inorganic materials, created over the course of millions and millions of years, in places where massive swamp-like forests existed. All their collective putrefaction, over time, creates things like peat bogs, tar pits, and petroleum deposits.
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