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Volcanism PDF

What is Volcanism?

 A volcano is any location where magma comes to the surface, or has done so within the past several

million years. This can include eruptions on the ocean floor (or even under the water of a lake), where

they are called subaqueous eruptions, or on land, where they are called subaerial eruptions. Not

all volcanic eruptions produce the volcanic mountains with which we are familiar; in fact most of

Earth’s volcanism takes place along the spreading ridges on the sea floor and does not produce volcanic

mountains at all—not even sea-floor mountains.


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