Plate tectonics

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Across
  1. 1. a sub type of convergent plate boundary.Oceanic -
  2. 3. last name of person who developed plate tectonics theory
  3. 4. how many major plates are there in the world?
  4. 8. the largest plate
  5. 10. when two plates crash together
  6. 11. another sub type of convergent plate boundary. Continental-
  7. 13. segments of the lithosphere that move and change shape
  8. 15. the study of earthquakes
  9. 16. when two plates go in the opposite direction
  10. 17. convergent plate boundaries can produce this
  11. 18. when all the continents were once joined together
Down
  1. 2. weaker region in the mantle
  2. 4. when one plate goes under another plate
  3. 5. an opening in the crust where lava and hot gases can erupt
  4. 6. plates glide over Earth’s ____
  5. 7. can be an after effect of an earthquake
  6. 9. When two plates slide past each other
  7. 12. rigid layer of the uppermost mantle and crust
  8. 14. the center of the Earth
  9. 17. how many centimeters plate tectonics usually move each year