Unit 4

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Across
  1. 2. created the theory of continentaldrift (last name)
  2. 3. where an earthquake originates
  3. 5. primary rock of continental crust
  4. 7. primary waves, trave, through anything
  5. 8. primary rock of oceanic crust
  6. 11. driving force of crustal movement (no spaces)
  7. 13. plate boundry where two plates collide
  8. 14. when two tectonic plates move away from each other
Down
  1. 1. scale used to measure the damage of an earthquake
  2. 4. secondary waves, travel through solids only
  3. 6. point on earth's surface above the focus
  4. 9. scale used to measure the strenght of an earthquake
  5. 10. where msot epicenters and volcanoes are
  6. 12. number of seismographs needed to find location