Plate tectonics crossword puzzle

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Across
  1. 4. melted rock on the earths surface
  2. 6. the first layer of the earth
  3. 7. a plate boundary were two plates move toward each other
  4. 13. second layer of the earth
  5. 15. a plate boundary were they move away from each other
  6. 17. The place where a collision between two continental plates crunches and folds the rocks at
  7. 18. super continent
  8. 19. this happens when the plates move
  9. 20. upper mantel and lower crust
  10. 21. a scientific theory that explains how our continents were made
Down
  1. 1. when two plates slide past each other
  2. 2. biggest chain of underwater
  3. 3. the person who discovered plate tectonics
  4. 5. upper layer of the mantel
  5. 8. African plates are coming apart
  6. 9. currents in the mantel
  7. 10. this process is created by a divergent boundary
  8. 11. the process in which the crust breaks a part
  9. 12. boundary
  10. 14. a vent on the earths surface in which magma comes out of
  11. 16. when one plate tectonic dives under another plate