Unit 8 complete

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Across
  1. 2. no mountains, no descents, no inclination
  2. 5. extremly tall building
  3. 7. 1/2
  4. 8. 100 years
  5. 11. go and live and work in another place
  6. 12. when too many people live in one place
  7. 14. a general change
  8. 17. no one living there
  9. 18. with lots of contamination
  10. 20. related to the city
  11. 21. opposite of 18 across
  12. 22. energies that will always exist
Down
  1. 1. very old and important
  2. 3. air, water, etc. dirty and dangerous
  3. 4. nothing, zero
  4. 6. when there isn't enough of something
  5. 9. with a lot of people
  6. 10. 12
  7. 13. with lots of small mountains going up and down
  8. 15. 10 years
  9. 16. related to the countryside
  10. 19. very new