Plate Tectonics

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Across
  1. 2. colliding
  2. 3. makes up 66% of the Earth
  3. 5. Alfred Wegener discovered what?
  4. 7. soft plastic-like layer
  5. 8. strong,lower part of the mantle
  6. 10. made of iron and nickel
  7. 12. hottest layer on Earth
  8. 13. makes up 1% of the Earth
  9. 14. a fracture or zone between 2 blocks
  10. 17. Harry Hess discovered what?
  11. 18. only layer which is liquid
  12. 19. slide past each other
  13. 20. explains how large pieces of the crust move
Down
  1. 1. move away from each other
  2. 4. rigd upper part of the mantle
  3. 6. large pieces of Earth's crust
  4. 9. the sinking regions of the Earths crust
  5. 11. properties involve reaction to applied force
  6. 15. act to squeeze an object
  7. 16. nature of something's ingredients