Plate tectonics and Earthquakes

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Across
  1. 3. centre of the earth, made of iron
  2. 4. rocky shell of the earth
  3. 6. point at which the rock first moves
  4. 9. method to determine the origin of an earthquake
  5. 11. scientist, continental drift
  6. 16. moving towards
  7. 17. earth's middle layer
  8. 18. cracks caused by movement of plates
  9. 19. moving away
  10. 21. envelope of gases surrounding earth
  11. 22. transfer of heat around in a circle
  12. 23. all the water on earth
Down
  1. 1. great southern continent
  2. 2. second wave to arrive
  3. 3. earth's outermost layer
  4. 5. this action creates mountains and hills
  5. 7. first wave to arrive
  6. 8. two plates moving past one another
  7. 10. great northern continent
  8. 12. point on surface, above earthquake
  9. 13. shaking, natural disaster
  10. 14. ____ plates
  11. 15. living things
  12. 20. supercontinent, contains all landmasses