Partial melting of oceanic crust and silica-rich sediments of continental margins ____.
A)yields magma richer in basalt than the source rock
B)is a major cause of earthquakes
C)causes off-gassing which increases global warming
D)yields magma richer in silica than the source rock
E)will form sedimentary rock

Question

Quizplus · Accepted Answer

Partial melting of oceanic crust and silica-rich sediments of continental margins yields magma that is enriched in silica compared to the source rock. This is because the sediments contain higher levels of silica than the basaltic crust they are melting with, resulting in a more evolved magma composition.

Partial Melting of Oceanic Crust and Silica-Rich Sediments of Continental