Across
- 2. A deep valley where two plates move in opposite directions
- 5. The thickest layer of earth that consist of the lithosphere and the asthenosphere
- 6. Alfred Wegener's theory that the Continents was once a huge landmass
- 8. A plate boundary that hit each other, moving it in different directions
- 11. What causes the tectonic plates to move through the lithosphere and the asthenosphere
- 12. A plate boundary that moves apart from each other
- 14. A landmass that broke apart 225 million years ago
- 16. A molten layer of iron and nickel surrounding the earth's inner core
- 17. A soft layer of the mantle and where the lithosphere floats
- 18. The process by which oceanic crust sinks beneath a trench and back into a convergent plate boundary
- 19. A deep and wide crack on the ocean floor
- 20. A ball of solid material at the center of the earth
Down
- 1. Where molten material makes new ocean floor
- 3. A crack in the lithosphere which rocks move along
- 4. A theory explaining the structure of the earth
- 7. A layer that forms on the surface of the earth
- 9. A plate boundary where two plates move together
- 10. An underwater mountain chain where a divergent plate boundary creates new ocean floor
- 13. A scientist who first learned about and told the Theory of the Continental Drift in 1912
- 15. A layer made up of part of the mantle and the crust