oceanography

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Across
  1. 4. made by molten lave rising to the surface
  2. 5. type of crust that is usually denser and younger
  3. 7. natural phenomena that occurs usually on transform boundaries
  4. 8. theory that the continents are moving'
  5. 10. formed by continent-continent collision
  6. 12. where a lithosphere goes under the other one
  7. 14. what is below the lithosphere
  8. 17. type of crust that is usually older and less dense
  9. 18. where 2 plates meet
Down
  1. 1. made up of the crust and upper mantle
  2. 2. type of boundary where plates move away
  3. 3. one of earth's layers, it is the largest layer
  4. 6. one of earth's layers, is the one in the center
  5. 8. how the plates are able to move
  6. 9. the number of plates there are on Earth
  7. 11. deep parts of the ocean caused by subduction zones
  8. 13. type of boundary where plates slide past each other
  9. 15. type of boundary where plates move together
  10. 16. where volcanoes form a circle
  11. 17. layer of Earth where we live