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moved petroleum to its own section
'''Oil''' is a viscous liquid that is not soluble in water and which is used for mainly for lubrication and fuel.
'''Oil''' is a viscous liquid that is not soluble in water and which is used for mainly for lubrication and fuel.
There are two main types of oil. One is derived from plants, such as [[olive]]s, and the other is obtained from geological sources, generally believed to be the remains of buried plant or animal material.
There are two main types of oil. One is derived from plants, such as [[olive]]s, and the other, petroleum, is obtained from [[Abiotic oil|geological sources]]. This article deals with vegetable oils.
== Uses ==
== Uses ==