Challenge it

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Across
  1. 2. The sudden release of strain energy in the Earth's crust, resulting in waves of shaking that radiate outwards from the earthquake source
  2. 4. Waves that travel through the interior of the Earth
  3. 6. Study of earthquakes and seismic waves
  4. 7. Waves of energy caused by an explosion or the sudden breaking of a rock in Earth
  5. 8. Move apart from each other
  6. 9. Fastest wave and can travel through solids and liquids
Down
  1. 1. Wave that can only travel through solids
  2. 3. Slide past each other other
  3. 5. Move towards each other
  4. 7. Tool used to record the motion of the ground during an earthquake