Plate Tectonics

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Across
  1. 4. ___ crust was close to ridge.
  2. 7. ___ came up with sea floor spreading.
  3. 8. What motion does sea floor spreading create?
  4. 11. HARD: Continents move one ___ annually.
  5. 12. ___ came up with continental drift.
  6. 14. ___ crust is created by ridges.
  7. 15. Evidence of sea floor spreading
  8. 16. Why was continental drift denied?
  9. 17. Oceanic crust is subducted to ___.
  10. 20. Wegener's theory was ___.
Down
  1. 1. Evidence of continental drift
  2. 2. What subducts crust?
  3. 3. Evidence of sea floor spreading
  4. 5. What century did Wegener discover continental drift?
  5. 6. What century did Hess discover sea floor spreading?
  6. 9. Name of super-continent
  7. 10. Process of crust being pulled down
  8. 13. Evidence of continental drift
  9. 18. ___ and SA fit together almost perfectly.
  10. 19. What does crust come out of?