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.The above text is a snippet from Wikipedia: Extrusive
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extrusive
Noun
- Rock which has been formed through volcanic extrusion.
Adjective
The above text is a snippet from Wiktionary: extrusive
and as such is available under the Creative Commons Attribution/Share-Alike License.