Volcanoes form above subduction zones because ________.
A) the lithosphere thickens above the subducting lithosphere and causes volcanoes to form
B) the subducting lithosphere melts as it descends and the magma rises to form volcanoes
C) water is squeezed out of the subducting slab and the water triggers melting of the overlying asthenosphere
D) the asthenosphere is displaced by the subducting lithosphere and rises to the surface to form volcanoes
Ans: C) water is squeezed out of the subducting slab and the water triggers melting of the overlying asthenosphere
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