Layer of the Earth

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Across
  1. 4. land or ground
  2. 7. inner middle of the earth
  3. 11. theory of the lithosphere
  4. 14. plates pushing away from each other
  5. 15. plates pulling away from each other
  6. 16. the top part of the mantle
  7. 18. oceanic crust
Down
  1. 1. outer middle of the earth
  2. 2. top layer
  3. 3. the rigid outer part
  4. 5. ridge system in the middle of the ocean
  5. 6. seafloor
  6. 8. the degree of compactness of a substance
  7. 9. below the top layer
  8. 10. super continent
  9. 12. great depression in the ground
  10. 13. sliding past each other
  11. 17. the nature of something's ingredients or constituents