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There are two plate ways this can happen.

At boundaries where one plate subducts, or moves under, the less dense plate, the subducting plate carries with it water and other easily vaporizes substances called volatiles. This lowers the melting point of the surrounding rock, causing some of it to melt. The resulting magma then rises toward the surface, potentially forming volcanoes.

At boundaries where two plates move apart there is an area where the crust is very thin. This lowers the melting point of the material, causing some of it to melt, rise to the surface, and form volcanoes.

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12y ago

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