Split Vowels

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Across
  1. 2. a reverse movement
  2. 4. rock in space
  3. 6. center of a cell
  4. 7. victory
  5. 11. building with special art or history
  6. 12. not making noise
  7. 13. able to speak or write smoothly
  8. 15. purple
  9. 17. destroy
  10. 18. absolute confusion and disorder
Down
  1. 1. the first person to do something
  2. 3. turn off
  3. 5. every year
  4. 8. opposite of 'automatic'
  5. 9. two people singing
  6. 10. math with shapes, angles, circles etc.
  7. 14. liquid
  8. 16. a small green area in a desert