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Seismic waves
Vibrations caused by earthquakes, used to study Earth's interior
P-waves (Primary)
Fast longitudinal waves that travel through both solids and liquids
S-waves (Secondary)
Slower transverse waves that travel through solids but NOT liquids
Evidence for liquid outer core
S-waves are not detected on the far side of the Earth
Evidence for solid inner core
Refraction patterns of P-waves detected on the far side of the Earth