Across
- 3. Continent
- 5. Spreading/Material continually being added
- 7. Plate
- 11. De Fuca/Smallest Plate
- 13. of boundary where plates rub against each other
- 18. Tectonics/Theory of plates in motion
- 19. Scientist
Down
- 1. of an ancient organism that has been preserved
- 2. that uses sound waves to measure distance
- 4. Drift/Wegener's Theory
- 5. Andreas Fault/Transform boundary in California
- 6. of the lithosphere
- 8. of boundary where plates push together
- 9. floor sinking into mantle
- 10. Trench/Underwater canyons
- 12. of boundary where plates pull apart
- 14. America/Africa and what other continent appear to fit together like puzzle pieces
- 15. Ridge/Long, underwater mountain chains
- 16. in the crust where plates slip past each other
- 17. of tectonic plates there are