plate tectonics

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Across
  1. 4. thickest layer of earth
  2. 8. core what is the liquid layer of the earth
  3. 12. what is it called when two plates collide horizontally
  4. 13. what is the outermost layer of the earth called
  5. 15. the breaking down of rock is called
  6. 17. what is Pangaea
  7. 18. These form under water (on the ocean floor) at most convergent boundaries
  8. 19. cracks in earth's crust
  9. 20. what element makes up most of the earth's core
Down
  1. 1. melted rock inside of earth
  2. 2. Word used to describe the state of the mantle.
  3. 3. who is alfred wegener
  4. 5. the border between two tectonic plates is called
  5. 6. Type of crust that is thick and contains granite.
  6. 7. two plates collide they make...
  7. 9. these shake the earth
  8. 10. when two plates move away from each other
  9. 11. what is it called when two plates collide vertically
  10. 13. large solid area of land
  11. 14. in earth's crust where magma comes out
  12. 16. When one tectonic plate moves underneath another one, it's called this.