Why are the travel-time curves for the P-wave and S-wave arrivals curved and not straight lines?
A) The greater the distance, the deeper the P and S waves travel, refracting through progressively denser layers.
B) During an earthquake, Earth shakes so much that it is like a quivering rubber ball and all of the distances are wrong.
C) They should be straight lines.Earth is flat and the time-travel graph proves it!
D) They have to bend with the curvature of the Earth.
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