What makes a great City?

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Across
  1. 2. - areas of land for public enjoyment
  2. 4. - a wide variety of plant and animal species in their natural environments
  3. 8. - free from dirt
  4. 9. - a colour between yellow and blue
  5. 10. - variety or difference
  6. 11. - places where goods are sold
  7. 12. - shared beliefs or behaviours
  8. 13. - human beings
  9. 14. - festivals
  10. 17. - free from danger
  11. 19. - elements of the natural world
  12. 20. - involved
Down
  1. 1. - group of people with common interests
  2. 3. - within one's financial means
  3. 5. - a tall plant
  4. 6. - alive
  5. 7. - easy to move around
  6. 12. - united or joined
  7. 15. - an activity that occupies a person's time
  8. 16. - safe for walkers
  9. 18. - continual reuse