P-Waves, Compress and expand like an accordion, Fastest of all wave types, Can travel through solids & liquids, The first waves to hit the surface, Primary Waves, , Longitudinal Waves, , Move parallel, S-Waves, S-Waves, , Vibrate from side to side or up and down, Slower than P-Waves, Can only travel through solids, Secondary Waves, Transverse Waves, , Move perpendicular, Reflection, When waves bounce off the liquid layer of the Earth, , , , , , Refraction, When waves change their speed and bend as they travel through different layers of the Earth, , , .

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