Tectonic Plates

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Across
  1. 1. Ridged outer layer, broken into tectonic plates
  2. 3. center of the Earth
  3. 5. arc-shaped chain of volcanoes
  4. 9. One plate is pulled under another
  5. 14. forms under the ocean when plates spread apart
  6. 16. Where tectonic plates float
  7. 17. Forms when tectonic plates move apart
  8. 18. Deepest part of the earth's oceans
  9. 20. Only liquid layer of the earth
Down
  1. 2. crust found under the oceans
  2. 4. When all of the continents were one/together
  3. 6. When plates push towards each other
  4. 7. A fracture between rock
  5. 8. Zone of frequent volcanoes in the pacific ocean
  6. 10. When plates move away from each other
  7. 11. Located directly below the crust
  8. 12. semiliquid rock located under earth's surface
  9. 13. Earth's outermost layer
  10. 15. When plates slide past each other
  11. 19. Steep-sided deppression in seafloor