What action in the crust causes volcanic activity
arkman2
Dear Arkman,
Actually, volcanism originates below the crust. Most magma is generated
in the upper mantle, including that under hotspots, mid-ocean ridges, and
subduction zones. Some monogenetic field magma may come from deeper in
the mantle.
However, the crust doesn't have nothing to do with the magma. There are
many examples where there is geochemical evidence that some of the crust
was melted and assimilated by rising magma as it passed through on its way
to the surface.
Sincerely,
Scott Rowland
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