extrusiveɪkˈstru sɪv, -zɪv
extrusive (adj)
English Definitions:
extrusive (adj)
of rock material; forced out while molten through cracks in the earth's surface
extrusive (Noun)
Rock which has been formed through volcanic extrusion.
extrusive (Adjective)
Jutting out; extruding.
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 main effect of extrusion is that the magma can cool much more quickly in the open air or under seawater, and there is little time for the growth of crystals. Often, a residual portion of the matrix fails to crystallize at all, instead becoming a natural glass or obsidian. If the magma contains abundant volatile components which are released as free gas, then it may cool with large or small vesicles such as in pumice, scoria, or vesicular basalt.
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"extrusive." Kamus.net. STANDS4 LLC, 2024. Web. 28 Mar. 2024. <https://www.kamus.net/english/extrusive>.
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