Science Crossword

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Across
  1. 4. device that uses sound waves to measure distance
  2. 5. Wegner was a _______
  3. 7. when the ocean floor sinks back into the mantle
  4. 9. pieces of the earth separated by cracks
  5. 10. a deep valley
  6. 13. the ocean that is expanding
  7. 16. heat transferred by the movement of fluid
  8. 17. scientist that came up with the idea of pangea
  9. 18. breaks in earths crust
Down
  1. 1. a super-continent
  2. 2. the measure of how much mass is in a given volume
  3. 3. transfer of energy through rays
  4. 6. plates come together
  5. 8. when the Plates are in slow constant motion its called
  6. 11. ancient item preserved in rock
  7. 12. large land masses that make up earth
  8. 14. plates slip past each other
  9. 15. plates move apart