Most of these active volcanoes are found in zones near both convergent
and divergent boundaries the lithospheric plates.
Many volcanoes are located along subduction zones, where one plate moves
under another plate.
The greatest amount of magma comes to the surface where plates are moving
apart along mid-ocean.
They are�volcanic regions thought to be fed by underlying mantle�that is
anomalously hot compared with the mantle elsewhere.
