Question

what causes melting at hotspots?
a there is not melting, just the mantle emerging through the crust.
b crust pressure
c mantle plumes
d boiling water
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Explanation:

Hotspots form when rising columns of superheated rock from deep within the mantle (mantle plumes) reach the lithosphere, causing decompression melting of the mantle rock. This melted rock then rises to form volcanic activity at the surface.

Answer:

c. Mantle plumes