What Is the Main Reason That Ray Paths of Seismic

question 81

Multiple Choice

What is the main reason that ray paths of seismic waves are curved like dipping arcs, rather than proceeding along the straightest, shortest path as they pass through the whole earth?

• A) The rock layers themselves are bent and sagged and the waves actually travel parallel to the distorted rock layers or beds.
• B) The earth gets too hot and the seismic waves steer away into the shallower, colder regions.
• C) The stiffest, most brittle rocks near the surface transmit sound waves better.
• D) Velocity increases with depth.

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