Plate Tectonics

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Across
  1. 4. type of plate that is relatively thin, young, and dense
  2. 9. break in the crust where movement has happened
  3. 11. type of volcano made by thin, fluid lava flows
  4. 12. long, narrow mountain chain where new ocean crust is made
  5. 14. downward movement of the edge of a plate into the mantle
  6. 15. ratio of mass to volume
  7. 16. area of the mantle that is usually warm and produces volcanic activity away from a plate boundary
  8. 18. sudden violent shaking of the ground
  9. 19. valley formed by the separation of tectonic plates
  10. 20. solid rock layer beneath the crust
  11. 23. boundary where two continental plates meet
  12. 24. type of volcano made by alternative layers of lava and ash
  13. 26. type of boundary where plates move towards each other
  14. 30. weak, flowing part of the mantle where convection occurs
  15. 31. material ejected from a volcano
Down
  1. 1. type of boundary where plates slide past each other
  2. 2. line where two or more tectonic plates meet
  3. 3. layer of the earth made of crust and the upper rigid part of the mantle
  4. 5. opening in the earth's crust which produces lava, gases, or ash
  5. 6. solid iron and nickel
  6. 7. type of volcano with steep sides formed by tephra in violent eruptions
  7. 8. outermost layer of the Earth
  8. 10. molten rock on the surface
  9. 13. transfer of heat through a fluid
  10. 17. Earth's only liquid layer
  11. 21. narrow, deep trough formed at a subduction zone
  12. 22. location on the fault where an earthquake begins
  13. 25. type of boundary where plates move away from each other
  14. 27. location on the earth's surface closest to the earthquake's focus
  15. 28. type of plate that is relatively thick, old, and less dense
  16. 29. molten rock below the surface