EXTRUSIVE

Extrusive

Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. This is as opposed to intrusive rock formation, in which magma does not reach the surface.

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extrusive

Noun

  1. Rock which has been formed through volcanic extrusion.

Adjective

  1. Jutting out; extruding.


The above text is a snippet from Wiktionary: extrusive
and as such is available under the Creative Commons Attribution/Share-Alike License.

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