Passing through the mantle below the asthenosphere,the seismic wave velocities vary but generally increase until about 2900-km depth where P-waves slow markedly and S-waves disappear at the core-mantle boundary zone.

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Quizplus · Accepted Answer

This statement is correct. Seismic wave velocities generally increase as they pass through the mantle below the asthenosphere, but then slow down and disappear as they reach the core-mantle boundary zone.

Passing Through the Mantle Below the Asthenosphere,the Seismic Wave Velocities