Earth Crossword Puzzle

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Across
  1. 2. breaks in the Earth`s crust
  2. 5. ocean floor sinks beneath a deep-ocean trench and back into the mantle
  3. 6. part of the Earth between the core and crust
  4. 7. the upper layer of Earth`s mantle
  5. 9. a measure of how much mass there is in a given volume of a substance
  6. 14. pieces of Earth`s crust diverge on land
  7. 15. plates move apart from each other
  8. 16. plates come together
  9. 18. plates slip past each other
  10. 19. super continet that existed about 300 million years ago
  11. 20. trace of an ancitent organism thats preserved in rock
Down
  1. 1. the rigid outer part of the Earth
  2. 3. formed by convergent boundaries colliding together
  3. 4. current the flow that transfers heat within a fluid
  4. 8. when mid-ocean ridges continually add new material to the ocean floor
  5. 10. deep underwater conyons
  6. 11. when continests slowly move over Earth`s surface
  7. 12. mountain ranges along the bottom of the Earth`s floor
  8. 13. theory that Earth`s plates are in slow constant montion
  9. 17. crust the outermost layer of Earth