Gracie 5th

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Across
  1. 3. original supercontinent
  2. 7. soft layer below lithosphere
  3. 9. movement of heat from one solid object to another
  4. 10. hot solid rock below crust
  5. 12. Crust and upper mantle
  6. 14. valley: divergent boundary on land
  7. 16. Trench: long deep depressions in ocean floor
  8. 17. boundary: plates move together
  9. 18. boundary: plates slide past each other
Down
  1. 1. sideways and downward movement
  2. 2. movement of heat energy through space
  3. 4. breaks in the crust where earthquakes occur
  4. 5. layer of rock
  5. 6. solid outer
  6. 8. underwater mountain system sea-floor spreading
  7. 11. boundary: plates spread
  8. 13. liquid and solid center
  9. 15. movement of heat in liquids and gasses