Earth's Formation and Plate Tectonics

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Across
  1. 3. name of large land mass that eventually split apart
  2. 7. movement of molten iron in the outer core creates the _ that surrounds the earth
  3. 9. an island _ forms when subduction happens between two ocean plates
  4. 12. plate boundary where 2 plates are sliding alongside each other
  5. 13. layer of the earth that is solid but soft enough to move very slowly
  6. 15. these waves are used to determine the depths and composition of earth's layers
  7. 17. Wegener's first name
  8. 19. the lithosphere is broken into pieces called _ plates
  9. 20. plate boundary where 2 plates are moving away from each other
  10. 22. underwater volcanic mountains that form where 2 ocean plates are diverging
  11. 23. there are 2 types of plates, _ and continental
  12. 27. Wegener noticed that the _ of the continents fit together like a puzzle
Down
  1. 1. formed when 2 continental plates move into each other
  2. 2. along with the islands of the same name, example of subduction zone
  3. 4. continent where the Great Rift Valley is found
  4. 5. uppermost functional layer of the earth
  5. 6. scientist who first proposed continental drift
  6. 8. example of collision zone
  7. 10. plate boundary where 2 plates are moving towards each other
  8. 11. this kind of valley forms when a continental plate is pulling apart
  9. 14. famous example of transform boundary
  10. 16. this type of electricity may have brought dust particles together in the planetary nebula
  11. 18. when subduction occurs it always creates a volcano and a _
  12. 21. Wegener noticed that _ grooves on different continents showed that they had been in places much colder in the past
  13. 22. Wegener noticed that _ laters on different continents were the same
  14. 24. process of warmer material rising and cooler material sinking. This causes the tectonic plates to move.
  15. 25. Wegener noticed that _ of plants and animals on different continents matched
  16. 26. when earth was molten, materials sank r rose based on their _