Igneous Rock

n. rock formed when molten magma becomes slightly cold and solidifies

Igneous rocks (etymology from latin ignis, fire) are rocks formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either the Earth's mantle or crust. Typically, the melting is caused by one or more of the following processes — an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust.
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Noun
1. rock formed by the solidification of molten magma
(hypernym) rock, stone
(hyponym) andesite
(substance-meronym) sodalite

A rock made from molten (melted) or partly molten material that has cooled and solidified.

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