When discussing the movement of seismic body waves through the Earth, what is a shadow zone?
A. A place on the surface where a certain type of wave received is weaker than usual
B. A place on the surface where a certain type of wave is not received
C. A place on the surface where a certain type of wave received is stronger than usual
D. A place on the surface where a certain type of wave received is faster than usual
Answer: A
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