plate tectonics

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Across
  1. 3. is a feature of convergent plate boundaries
  2. 5. plates collide into each other
  3. 7. the lithosphere is divided into a number of crustal plates
  4. 8. drift
  5. 9. tectonics
  6. 15. trenches
  7. 16. forms where tectonic plates move apart, or rift.
  8. 17. valley
  9. 18. hot fluid is in the earths crust
Down
  1. 1. plates crosses each other
  2. 2. theory that the configuration of Earth's continents was once different than it is today
  3. 4. is the outermost shell of a terrestrial planet
  4. 6. boundary
  5. 10. boundary
  6. 11. plates move away from each other
  7. 12. boundary
  8. 13. floor spreading
  9. 14. is a process in which tectonic plates split apart