Which of the following statements about the continental crust is NOT true?
A) Continental crust is least dense near the surface and most dense near the base.
B) The smooth increase in the speed of P wave toward the base of the crust indicates that the composition of the crust is homogeneous.
C) The average speed of P waves through continental crust is 6 kilometers per second near the surface and 7 kilometers near the base.
D) P waves travel faster near the base of continental crust than they do near the surface, possibly because of a pressure- induced increase in rigidity.
Correct Answer:
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