Which is the primary process involved in the formation of magma at a subduction boundary?
a) water released by rocks plunging into the asthenosphere lowers melting temperatures.
b) a decrease in pressure lowers the melting temperatures of rock materials.
c) a plume of heated material rises from deep within the core.
d) heat from the core melts the plates at subduction boundaries.
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Which is the primary process involved in the formation of magma at a subduction boundary?
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