tectonic plates

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Across
  1. 4. what is the center of the earth called
  2. 8. was a theory 50 years ago
  3. 12. plates crashed together forming -------
  4. 15. was a theory in 1912
  5. 16. where does earthquakes happen on plates
  6. 17. plates that are under the ocean
  7. 18. what is the first layer of the earth called
  8. 19. South America and Africa --- together
  9. 20. which ocean is the fire located
Down
  1. 1. plates crashed together
  2. 2. if similar fossils are seen all around the world that means that the world may have been --------
  3. 3. where 90% of the world earthquakes
  4. 5. ice sheets,mountains,fossils and continents fitting together is -------- that the theory of continental drift may be true
  5. 6. a plate slides under another plate
  6. 7. plates that are under the continents
  7. 9. how many major plates are there
  8. 10. mega continent
  9. 11. move on the liquid layer
  10. 13. how minor plates are there
  11. 14. What plate is the ring of fire mainly located