Tectonic Plates

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