• A more direct means to learn about interiors is through seismology…..
• When seismic activity occurs, rocks under enormous stress suddenly shift, releasing large amounts of energy…..

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• Two types of waves carry energy away from a seismic region:

Compression Waves (P) Waves

Shear Waves (S) Waves

• Compression waves (P waves) travel twice as fast as shear waves (S waves)
• Shear waves (S waves) cannot pass through liquid, while compression waves (P waves) can pass through liquid.