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P. 33
Where plates collide and
one plate sinks back into the mantle, magma is released that can melt its way back to the surface and provide the source material for volcanoes. Most volcanoes in this location erupt violently and produce large amounts of ash as well as some lava.
(Right) The distribution of volcanoes that have been active in the last three centuries and their association with spreading plate boundaries (purple lines), destructive or colliding plate boundaries (pink lines), and
hot spots.
Tectonic plate moving away from spreading boundary and between the rising and sinking parts of the convection cell
Ocean crust
Trench
Continental crust
Mountain root
Convection currents
Volcanoes that form at this spreading boundary are usually quiet and mostly erupt lava.
Tectonic plate moving away from spreading boundary and between the rising and sinking parts of the convection cell
Rising current
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Fold mountains and volcanoes
Rising current Convection currents
