Volcanoes and Earthquakes

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Across
  1. 2. an instrument that records and measures an earthquakes seismic waves
  2. 5. the hanging wall slips downward, occur on divergent plate boundary
  3. 6. rocks slip past one another sideways
  4. 7. hanging wall moves up and the footwall moves down
  5. 11. stress that pushes a mass of rock in two opposite directions
  6. 13. seismic waves that vibrate from side to side or up and down through solids
  7. 15. uses data from seismographs to assign a magnitude to an earthquake
  8. 18. magnitude scales that rate small earthquakes based on its waves
Down
  1. 1. rates the amount of shaking form an earthquake by observations
  2. 2. waves that move more slowly and produce more ground movement
  3. 3. a large area of flat land elevated high above sea level
  4. 4. a force that acts on a rock to change its shape or volume
  5. 8. the shaking and trembling that results from the movement if earth beneath earths surface
  6. 9. the point on the surface right above the focus
  7. 10. a stress that produces reverse faults
  8. 12. rocks slip past each other sideways
  9. 14. the point beneath earths surface where rock begins to break under stress and triggers an earthquake
  10. 16. the first seismic wave to arrive and it compresses and expands the ground like an accordion
  11. 17. the record of an earthquakes seismic waves
  12. 19. stress force that pulls on the crust where two plates are moving apart