Seismic refraction is caused by a. seismic waves bending. b. a change in velocity of seismic waves. c. sharp rock boundaries. d. all of the above. e. a and b.   The boundary that separates the crust from the mantle is called the a. lithosphere. b. asthenosphere. c. Mohorovi?ci´ c discontinuity. d. none of the preceding.

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