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Extrusive Volcanism
Volcanic rock, which is a category of extrusive igneous rock.
Igneous rocks are described as intrusive or extrusive based on formation. Intrusive rocks forms underneath the earth surface, while extrusive rocks forms on the surface of earth.
Normally the crystals in extrusive igneous rock are small enough as to not be visible without magnification. The exception would be a porphyritic rock that has visible crystals dispersed in a fine-grained matrix. This type of rock represents a partial cooling of magma before expulsion by volcanism.
volcanism can not cause earthquakes
No. Volcanism occurs at the surface on the crust. However, the magma that drives volcanism ultimately comes from the mantle.
it is extrusive
Extrusive
extrusive
Extrusive
Extrusive
extrusive