Plate tectonics

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Across
  1. 4. plates move past each other
  2. 8. seafloor spreading occurs along
  3. 9. the largest tectonic plate
  4. 10. plates move toward each other
  5. 12. Shield volcanoes are mostly made of
  6. 14. ___ volcanoes are mostly at subduction convergent boundaries
  7. 15. ____ spreading ridges form tall, narrow underwater cliffs/mountains
  8. 16. there are ___ minor tectonic plates
  9. 17. a fracture zone/fractures between two blocks of rock
  10. 18. ___ spreading ridges have much more gentle slopes
  11. 19. this plate includes the oceanic crust of the Indian Ocean
Down
  1. 1. Tectonic plates are huge
  2. 2. There are ___ major tectonic plates
  3. 3. plates are similar in density and collide
  4. 5. convergent boundaries can be classified as
  5. 6. these mountains form a volcanic arc
  6. 7. plates that move apart
  7. 9. of (crust and upper mantle)
  8. 11. the largest volcanoes on Earth
  9. 13. describes earthquakes that occur at transform boundaries