Oil is either dug up from the ground or separated from vegetables like [[olive | olives]]. Wars are often started from oil.[http://www.moles.org/ProjectUnderground/drillbits/5_10/3.html]
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'''Oil''' is a viscous liquid that is not soluble in water and which is used for mainly for lubrication and fuel.
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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.