science project

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Across
  1. 5. the layer on the mantle that the lithosphere floats on
  2. 6. a split in the lithosphere
  3. 9. a plate boundary where two plates spread apart
  4. 11. the landmass that broke apart 25 million years ago
  5. 12. the cycle that drive sea floor spreading
  6. 13. a deep canyon in the ocean floor
  7. 15. the larger of the core layers
  8. 16. Theory that pieces of the Earth's lithosphere are in motion
  9. 17. the innermost layer of the Earth
  10. 18. a plate boundary where two plates slide past each other
  11. 19. the largest layer of the Earth
Down
  1. 1. Alfred Wegener's theory that continents drifted apart
  2. 2. sea floor spreading apart along ridges
  3. 3. a large ridge in the ocean that seafloor spreads from
  4. 4. the thinnest layer of the Earth
  5. 7. the german scientist who developed the theory of plate tectonics
  6. 8. the brittle layer including the upper mantle and crust
  7. 10. a convergent boundary where one plate slides under the other
  8. 12. a boundary where two plates push together
  9. 14. a deep valley on a divergent boundary