tectonic plates

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Across
  1. 1. what crust is thicker?
  2. 4. how many layers are in earth?
  3. 7. what is the biggest layer?
  4. 10. what plates slide alongside each other?
  5. 11. what is the only liquid layer?
  6. 13. what layer in the mantle is made up of covectional currents?
  7. 15. what forms if two continental plates collide?
Down
  1. 2. what was the name of the person who created the theory of continental drift?
  2. 3. what plate moves toward each other?
  3. 5. what is the name of the super continent?
  4. 6. what layer in the mantle is made up of broken rocks?
  5. 8. who created the theory of sea floor spreading?
  6. 9. what plate moves away from each other?
  7. 12. what is the thinnest crust?
  8. 14. how many million years ago was Pangaea formed?