plates

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Across
  1. 3. when a dense oceanic plate is forced under a less dense plate
  2. 7. theory that breaks earth’s lithosphere into plates
  3. 9. less dense layer of earth where the continents are found
  4. 11. an instrument used to measure earthquakes
  5. 12. an arc of islands in an ocean formed by subduction
  6. 13. dense rock layer of earth under the ocean
  7. 15. (abyssal plain) - large, deep, flat area of an ocean
  8. 18. dangerous places where lava forms new rock
  9. 20. the boundary where two plates are moving past each other
  10. 21. a sudden movement of tectonic plates
  11. 23. solid, very hot and dense, mostly iron layer of earth
  12. 24. underwater mountain range caused by two diverging tectonic plates
  13. 26. the boundary where two plates are moving away from each other
Down
  1. 1. these enabled us to map the layers earth’s interior
  2. 2. theory that states the continents are moving on earth
  3. 4. the movement of material due to a difference in density
  4. 5. the number of different plate boundary types
  5. 6. a large mass of Earth or rock that rises high above earth’s surface
  6. 8. the most viscous and explosive type of magma, rich in oxygen and silicon Maficmagma runny, iron rich magma that comes from deep inside earth
  7. 10. least dense layer of Earth that makes up our tectonic plates (crust)
  8. 14. magma that reaches the surface of earth
  9. 16. Earth’s largest layer, plastic-like, and where convection occurs
  10. 17. a fracture in earth’s crust that is caused by tectonic forces
  11. 19. liquid, very hot and dense, mostly iron layer of earth
  12. 22. the boundary type where mountains and trenches are formed
  13. 25. deep, steep valley in the ocean, caused by subduction