What is the difference between an intrusion and extrusion?

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asked Jun 3, 2018 188k views

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Xiay · Answer 1 · 2018-06-08T04:21:23+0000

Intrusions are magmas that intrude into a preexisting rock.
Extrusion are lavas that extrude onto the surface of a preexisting rock (i.e. the surface of the Earth, whether it is on dry land or under water).

What is the difference between an intrusion and extrusion?

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