Multiple Choice
Which of the following marks the boundary between the crust and the mantle?
A) a decrease in P-wave velocity and a change in rock type
B) an increase in P-wave velocity and a change in rock type
C) a decrease in P-wave velocity,but no change in rock type
D) an increase in P-wave velocity,but no change in rock type
Correct Answer:

Verified
Correct Answer:
Verified
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