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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