Plate Tectonics

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Across
  1. 2. continental crust containing silica and aluminum
  2. 3. a sudden violent shaking of the crust
  3. 5. a vent or opening in the crust from which magma can reach the surface
  4. 7. a more specific term for the subduction zone
  5. 8. oceanic crust containing silica and magnesium
  6. 10. landforms created when continental plates collide
  7. 12. a force causing plate movement as plates are pulled into subduction zones
  8. 13. the supercontinent that existed billions of years ago
  9. 16. scientist who first proposed theory of plate tectonics
  10. 17. the central layer of the earth formed of iron and nickel
  11. 19. a layer of the earth containing the crust
  12. 23. the longest mountain range in the world
  13. 24. a force causing plates to move away from ocean ridges
  14. 25. a deep sea landform located where subduction occurs
  15. 27. the act of one plate being forced under another due to higher density
Down
  1. 1. an intense area of heat in the mantle that burns through the lithosphere
  2. 2. Hess' theory that was proved by paleomagnetism
  3. 4. a ductile layer of the earth in which convection occurs
  4. 6. a landform created by oceanic-oceanic subduction
  5. 9. the magnetic alignment of minerals
  6. 11. the study of ancient magnetism in rock
  7. 14. a plate boundary where plates move parallel to one another
  8. 15. found at right angles to ocean ridges- like discs in a spine
  9. 18. when a recumbent fold collapses on itself
  10. 20. a landform created when continental plates diverge
  11. 21. valleys found between horsts
  12. 22. a large wave caused by underwater tectonic activity
  13. 26. a block shaped landform created as plates separate