Tectonic Plate Puzle

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Across
  1. 4. Rock made of ash
  2. 5. A deadly mountain
  3. 11. A big wave
  4. 13. Converging plates
  5. 15. Eruption Power scale
  6. 16. Cars turning at high speed
  7. 18. The moving crust of the earth
  8. 20. A Large tremor
Down
  1. 1. Expulsion of material
  2. 2. The meeting place of continental plates
  3. 3. Consistently erupting volcano
  4. 6. Rock avalanche
  5. 7. Black, glassy rock
  6. 8. The worst part of pizza
  7. 9. Study of the physical world
  8. 10. Johnny Cash song
  9. 12. Famous Pokemon trainer
  10. 14. The ledge above a fire
  11. 17. Grey rock, sounds like a common seasoning
  12. 19. Very hot rock