Geology unit 3

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Across
  1. 2. When a denser plate descends into the mantle at the same rate as seafloor production
  2. 7. Mountain formed by subduction of oceanic lithosphere beneath a continent
  3. 10. boundary in which two plates slide past each other
  4. 12. a continuous elevated zone on the floor of all major ocean basins
  5. 14. processes that deform Earth’s crust to create major structural features
  6. 15. Formed from transform boundaries
  7. 18. Volcanic islands created by subduction of one oceanic plate under another
  8. 19. boundary in which two plates move apart
  9. 20. hypothesis suggesting new oceanic crust is created at the crests of mid ocean ridges
Down
  1. 1. boundary in which two plates move together
  2. 3. The primary source of plate movement
  3. 4. The largest tectonic plate
  4. 5. Supercontinent containing all of the existing continents
  5. 6. The place where convection takes place in the earth
  6. 8. Suggests that all present continents once existed as a supercontinent
  7. 9. Came up with the continental drift theory
  8. 11. Age of lithosphere that results in a high angle of decent/deep trench
  9. 13. Common disaster at or near faults
  10. 16. Age of lithosphere that results in a low angle of decent/shallow trench
  11. 17. narrow, elongated depression of the seafloor