Crossword

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Across
  1. 1. A number of things or parts working together
  2. 4. How good something is
  3. 6. Used in specifying the hour of the day
  4. 8. To save e.g. energy
  5. 10. Harmful to the environment
  6. 11. Equivalent
  7. 12. Opposite of clockwise
  8. 14. A three dimensional measurement
  9. 16. At a later part in time
  10. 17. Opposite of forwards
  11. 21. Two weeks
  12. 22. Childish argument
  13. 23. The start
Down
  1. 2. Make bigger
  2. 3. Depth of liquid
  3. 5. Direction
  4. 7. Completely destroy
  5. 9. Smaller than a centimetre
  6. 13. An informed guess
  7. 15. To keep alive or in existence
  8. 16. Brought into social contact
  9. 18. How long something takes
  10. 19. How many
  11. 20. Prize after achieving something