Plate tectonics puzzle

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Across
  1. 3. When two plates move away from each other
  2. 6. Man who came up with plate tectonics
  3. 8. What makes volcanos in the middle of tectonic plates
  4. 12. When two plates converge on each other
  5. 13. Large wave made by sea earthquakes
  6. 14. What made the Hawaiian islands
  7. 15. Superheated ball of iron and nickel
  8. 18. Where sea floor is destroyed
  9. 19. When plates grind, then slip past one another
  10. 20. Supercontinent
Down
  1. 1. Layer of liquid metal
  2. 2. Showed evidence of continental drift
  3. 4. When two plates move side to side in opposite directions
  4. 5. Thin layer of cooled rock
  5. 7. How strong an earthquake is
  6. 9. When new sea floor is made and destroyed
  7. 10. An sudden explosion that releases ash and lava from a volcano
  8. 11. What moves the plates
  9. 16. Where convection currents are
  10. 17. Crack where magma seeps through