Oil is a type of power known as a fossil fuel. Fossil fuels are made of plant life [tree truns and leaves] that broke down thousads or even milions of years ago and broke down into a liquid form, oil.
Now days because oil is buried deeper and deeper under the ground companies have begun to search under the ocean. But it is a very expensive and dangerous process, because if one drop got out it could stat to kill marine life. There are many places that you can look for oil under the sea, if the oil deposit is near the coast you can set up an oil rig which touches the ocean floor, if it is a bit deeper floating oil rigs can pump it up and if it is extremely deep you must use driller ships.
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