Plate tectonics: crossword puzzle

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Across
  1. 2. the Process where new oceanic crust forms at mid-ocean ridges.
  2. 3. Events such as earthquakes and volcanoes caused by Earths processes.
  3. 5. the outermost layer of the Earth.
  4. 7. A deep valley in the ocean floor formed by subduction.
  5. 8. Type of crust found under oceans.
  6. 12. Where two continental plates collide.
  7. 17. a very large landmass made of all continents joined together.
  8. 19. Early theory stating continents slowly move over Earth’s surface.
  9. 21. Sudden shaking of Earth caused by plate movement.
  10. 23. A large ocean wave caused by undersea earthquakes or eruptions.
  11. 24. a naturally occurring solid material that makes up Earth.
  12. 25. a plate boundary where plates move apart.
  13. 26. Earth’s outer rocky layer.
  14. 28. The thick layer beneath Earth’s crust
Down
  1. 1. Long underwater mountain chains.
  2. 4. Process where one plate sinks beneath another.
  3. 6. The point underground where an earthquake begins.
  4. 9. A volcanic area fed by magma from deep within Earth.
  5. 10. a plate boundary where plates slide past each other.
  6. 11. the theory explaining the movement of Earth's plates.
  7. 13. Preserved remains or traces of ancient life.
  8. 14. Scientist who proposed sea-floor spreading.
  9. 15. the ancient super continent that existed millions of years ago.
  10. 16. The solid center of the Earth.
  11. 18. Rigid outer layer made of crust and upper mantle.
  12. 20. Molten rock that erupts from volcanoes.
  13. 22. Vibrations that travel through Earth during an earthquake.
  14. 27. A crack or break where Earth’s crust is pulling apart.