Pangea and "the Drift"

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Across
  1. 3. crust formed by volcanic activity
  2. 6. evidence of continental drift
  3. 8. tectonic plate goes under another plate
  4. 11. continental drift was a ____ at first
  5. 12. caused by cooling and radioactivity
  6. 15. example of divergent boundary
  7. 16. adds material to the sea-floor
  8. 17. when Pangea formed 260 _____ years ago
  9. 18. deepest part of ocean floor occur here
  10. 20. name of all of the continents together
  11. 21. stress on plates overcome the plate friction
Down
  1. 1. the type of rock that lava is made of
  2. 2. when plates move away from each other
  3. 4. another result of moving plates
  4. 5. of Fire example of convergent boundary
  5. 7. studies earthquakes
  6. 9. edge of 2 tectonic plates coming together
  7. 10. when 2 plates crash into each other
  8. 13. plates sliding past each other
  9. 14. where the convection currents occur
  10. 19. when tectonic plates come together