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An S wave is slower than a P wave and only moves through solid rock. This wave moves rock up and down, or side-to-side. Because P waves are compression waves, they can move through a liquid. However, S waves cannot move through a liquid. This is because a liquid is not rigid enough to transmit an S wave.
Best Answer: P waves travel through both solids and liquids but slow down in the liquid layers of the Earth. S waves travel through solids but are absorbed by the liquid layers of the Earth. S waves travel slower than P waves and are transverse (P Waves are compressional). These factors could be why P waves don't have the energy to pass through liquids. Also, this is why there is a large S wave shadow zone.