Crossword Puzzle 426-450

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Across
  1. 3. past tense of know
  2. 6. an apparatus with mechanical power and having several parts
  3. 10. before the present; earlier
  4. 12. opposite of more
  5. 13. a person who studies science
  6. 14. definite; unquestionable
  7. 19. to deliberately avoid harm or errors
  8. 20. opposite of outside
  9. 22. the outside part of something
  10. 23. a large body of salt water
  11. 24. not anything; no single thing
Down
  1. 1. make or manufacture something to sell
  2. 2. have or hold someone or something within
  3. 4. past tense of stand
  4. 5. a structure with a roof, floor and walls
  5. 7. a brief written letter
  6. 8. the lowest part of something in which other things rest on
  7. 9. a circular object that revolves on an axel
  8. 11. remain in the same place
  9. 15. a piece of land completely surrounded by water
  10. 16. the route followed by a ship, aircraft, road, or river
  11. 17. blue mixed with yellow makes this color
  12. 18. to quit moving; to take a nap
  13. 19. a set or category of things or people
  14. 21. a period of 7 days