plate tectonics

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