Sea floor spreading

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Across
  1. 2. Break in earths crust
  2. 3. plates slide passed
  3. 10. A landmass called the super continent
  4. 11. Pieces on earth
  5. 14. Crust on land less dense
  6. 15. a scientist
  7. 16. is any trace of an organism that lived once
  8. 18. where sea floor spreading starts
  9. 19. Idea that the continents slowly move over Earth's surface
  10. 20. The best kid in the world everrrrr
  11. 21. Crust beneath the ocean that is more dense
Down
  1. 1. A point where two regions meet
  2. 4. A device that uses sound waves
  3. 5. a deep valley
  4. 6. The second layer in the earth after the crust
  5. 7. Cannons in the ocean
  6. 8. Plate motion
  7. 9. Spreading in the ocean
  8. 12. ocean floor sinks back into the mantle
  9. 13. Plates collided
  10. 17. Plates separate