griffin's earth science vocabulary crossword

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