Across
- 2. dense sphere of nickel and iron at the center of the earth
- 3. plate that forms the continents
- 5. undersea trench where new ocean floor is produced through seafloor spreading
- 6. when this occurs north and south switch
- 7. undersea valley that can be the deepest place in the world
- 9. crust that holds the world's oceans
- 15. German scientist who theorized that the continents move
- 16. layers sectioned based on the chemical makeup of the layers and by density
- 19. used locate the north and south in relation to where it cooled down
- 24. very hot material in its liquid state
- 25. field generated from convection currents in the mantle
- 26. this drives plate movement
- 27. outermost layer of the earth
- 28. layer of the earth that protects us from most asteroids
Down
- 1. combined upper mantle and crust string and rigid solid rock
- 4. science of dating rocks based on the magnitite
- 7. layer of molten iron and nickel surrounding the center of the earth
- 8. occurs when plates interact in violent ways
- 10. layers sectioned based on physical properties and behavior
- 11. idea that all the continents have moved, developed by Alfred Wegener
- 12. layer of hot, solid material is between earth's crust and core
- 13. plate boundary where the plates are moving together
- 14. makes up most of the continental crust
- 17. molten mixture of rocks, gasses, and water from the mantle
- 18. drew maps of the seafloor that provided evidence for continental drift and seafloor spreading
- 20. chain of volcanic islands that formed through subduction
- 21. partially molten mechanical layer that the tectonic plates float on
- 22. makes up most of the oceanic crust
- 23. plate boundary where the plates are moving apart