Earthquakes

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Across
  1. 3. area of the earth where p-waves and s-waves can't be detected by seismographs
  2. 5. fracture in the earth's crust that causes rocks to slide against one another
  3. 9. relative size of an earthquake characterised by a number
  4. 10. place on the earth's surface directly above the focus
  5. 11. where an earthquake starts underground
  6. 14. layer of the earth between the crust and the core
  7. 17. measures intensity of an earthquake
  8. 18. rocks on both sides of a fault deform under pressure during an earthquake
  9. 19. small earthquakes that precede larger earthquakes in the same place
  10. 20. instrument that records force and duration of an earthquake
Down
  1. 1. waves that move at the surface of the earth
  2. 2. wave that moves through the interior of the earth
  3. 4. body waves that shake the ground parallel to the wave
  4. 6. small earthquakes that occur after a larger earthquake in the same location
  5. 7. earth's crust and upper mantle
  6. 8. measures the magnitude of an earthquake
  7. 12. body waves that shake the ground perpendicular to the wave
  8. 13. severity of an earthquake by its effect on people and the earth
  9. 15. upper layer of the earth's mantle
  10. 16. an area with several closely spaced