plate tectonic crossword

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Across
  1. 3. a deep depression of the sea floor caused by the subduction of one plate under another
  2. 6. zones, where plates slide under another plate
  3. 8. beneath lithosphere, "plastic mantle; higher temperature and pressures
  4. 10. plates that separate
  5. 11. boundary, the point where two plates meet
  6. 12. spreading, when divergent plates beneath the ocean waters move apart to make new seafloor
  7. 13. the name of all the continents together as one
  8. 14. plates that slide past one another
  9. 16. the ridges made by the plates; on land
  10. 17. Wegner, who came up with the theory that the continents were once together
  11. 18. layer of Earth that is the only liquid layer
  12. 19. zones, an area in the middle of a continental plate where the plate is beginning to separate
Down
  1. 1. a crack in the Earth's crust where rocks slide past one another
  2. 2. made from crust and upper mantle; rigid plates and low temperatures
  3. 4. the name for a land plate
  4. 5. colliding plates
  5. 7. drift, the difference densities of the mantle (warm and cool) that rise and sink causing a circular motion
  6. 9. a plate that is under a large body of water
  7. 15. ridges, underwater mountain ranges where the crust is spreading apart creating new ocean floor