Tectonic Crossword

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Across
  1. 3. A deep valley that forms when plates move apart
  2. 4. occurs when two plates collide
  3. 7. pieces of the earth's lithosphere are in slow motion
  4. 9. When two plates move apart
  5. 10. mountain range underwater
  6. 12. areas where large numbers of active volcanoes
  7. 13. Ridge a divergent boundary on the Atlantic floor
  8. 15. mountains rising from oceanic floor
  9. 17. the idea that all of the continents were joined together
  10. 18. cracks in the earth's crust
  11. 19. A deep canyon in the oceanic floor
  12. 20. plates move away from each other
Down
  1. 1. plates grind past each other
  2. 2. plates move toward each other
  3. 5. oceanic crust is created underwater
  4. 6. to break off
  5. 8. movement of a fluid
  6. 11. a plate diving under another plate
  7. 14. quality of being easily shaped or formed
  8. 16. stated theory's of plate tectonics and continental drift