Plate Tectonic Terms

1234567891011121314151617181920
Across
  1. 4. earth's outermost layer
  2. 7. 90% of earthquakes occur inside of this ring
  3. 8. an instrument used to record the motion of the ground during an earthquake
  4. 10. there are this many major tectonic plates
  5. 13. a weaker layer of earth that is beneath the lithosphere
  6. 14. Alfred Wegener suggested that this was happening to the continents
  7. 15. a phenomenon caused by the slipping of tectonic plates
  8. 18. when crust is destroyed as one plate goes under another
  9. 20. super continent that existed hundreds of millions of years ago
Down
  1. 1. the solid outer part of earth. It includes the upper part of the mantle and the crust
  2. 2. when new crust is created as two plates pull away from each other
  3. 3. when crust is not created or destroyed, as the plates slide past each other horizontally
  4. 5. last name of the person who proposed "continental drift"
  5. 6. large pieces of earth's crust and mantle
  6. 9. a split between two bodies (ex: two plates)
  7. 11. the centre of the earth
  8. 12. the proper term for molten rock
  9. 16. last name of the person who invented the seismic magnitude scale
  10. 17. formed when lava flows through cracks in the earth
  11. 19. earthquakes and volcanoes occur along the _____ of plates