Ls 14

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Across
  1. 4. colorless, odorless gas that's in air
  2. 9. artificial substance relating to chemistry
  3. 10. attack "payed back" for a similar attack
  4. 14. used to single out one person or thing
  5. 15. more than is necessary
  6. 17. destroy utterly; obliterate
  7. 18. repeatedly cutting small slices from
  8. 19. to delay or postpone an action
  9. 20. important public or official announcement
Down
  1. 1. average in amount, intensity, and quality
  2. 2. done consciously and intentionally
  3. 3. things that are considered worthless
  4. 5. a container for something; a boat or ship
  5. 6. a change so precise it's hard to notice
  6. 7. continuous movement through a closed system
  7. 8. substance that provides nourishment
  8. 11. stated clearly and in extreme detail
  9. 12. any person in need of help or kindness
  10. 13. a formal announcement of conditions
  11. 16. important; famous; noticeable