Across
- 2. transport
- 4. to fall
- 7. spreading
- 9. dirty water
- 10. new settlements out of the city
- 12. loud sounds
- 14. where people live
- 15. locked
- 16. centre
- 17. the increase of importance of large cities
- 18. the throw back of heat
Down
- 1. dirtying the environment
- 3. industry and trade
- 5. from combustion processes
- 6. close together
- 8. to store
- 11. when you have nothing to eat
- 13. networks: important for the society and economy