Oil comes from organic material that over millions of year becomes underground and due to pressure and heat eventually turns into a liquid and hydrocarbons.
Oil comes from the ground (well, crude oil does, there are many other types, but we must refine the stuff to get at the oil we use for energy, transportation, and heating purposes). But how did it get there? Oil comes from stuff that once lived in the past (wiki calls it “ancient biomass”), but was buried underground. Then, over a very long time, the decomposed plant matter (as well as animal tissues) undergoes processes where it changes its chemical composition. “Today’s oil formed from the preserved remains of prehistoric zooplankton and algae, which had settled to a sea or lake bottom in large quantities”—wikipedia.org They say that plants form mostly coal. But any carbon based life form (anything organic) could potentially yeild a hydrocarbon of one type of another. Oil can also be made synthetically, without the use organic compounds. There is also another theory, but you can read about that on your own, by checking out this link: Scroll down to where it says—Abiogenic origin—if you care about that mumbo jumbo! I think it’s safe to say that it came from plant and animal life that has gone through an endothermic reaction (energy was added to the system, stolen from the earth’s heat [it’s hot down there!]) under the earth’s crust, and rearranged it’s atoms so that there is much chemical potential energy stored in it, and thus, it is precious and not to be squandered lightly or without thinking over how lucky we are that we have any in the first place!
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