'''Oil''' is a [[viscosity|viscous]] [[liquid]] that is not [[solubility|soluble]] in [[water]] and which is used for mainly for lubrication and [[fuel]].
'''Oil''' is a [[viscosity|viscous]] [[liquid]] that is not [[solubility|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, petroleum, is obtained from geological sources.
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There are two main types of oil. One is derived from plants, such as [[olive]]s, and the other, [[petroleum]], is obtained from geological sources.