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What is the difference between an intrusion and extrusion?
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What is the difference between an intrusion and extrusion?

User Foundry
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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).
User Xiay
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