plate tectonics

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Across
  1. 4. pieces of earth separated by cracks
  2. 6. heat transfer from air currents
  3. 10. underwater ocean ranges
  4. 12. breaks in the earth's crust
  5. 13. the uppermost part of the mantle
  6. 17. how much mass there is in a given amount of volume
  7. 19. plates collide
  8. 20. plates slip past eachother
Down
  1. 1. any trace of an ancient organism preserved in rock
  2. 2. a layer of hot rock
  3. 3. earth's plates that are in slow constant motion
  4. 5. a large body of water
  5. 7. a supercontinent that existed 2 million years ago
  6. 8. deep underwater canyons
  7. 9. - an idea that continents slowly move
  8. 11. german scientist who discovered that the continents were together at one point
  9. 14. a process where the ocean floor sinks in the mantle
  10. 15. a process that adds new material to the ocean floor
  11. 16. plates come together
  12. 18. a mountain that erupts
  13. 21. forms when pieces of earth's crust diverge on land