found at constructive & destructive plate margins
oceanic subducts under continental as more dense.
- oceanic plate subducts into mantle; melts and destroyed.
- pool of magma forms
- magma rises through cracks in crust (vents)
- magma erupts on surface (where called lava), forming volcano.
- magma rises up into gap formed when plates move apart
some volcanoes form over hot spots (really hot parts of mantle) eg Hawaii
Types of volcano:
- made of ash…