Challenges of an urbanising world

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Across
  1. 3. Cities which play a disproportionate role in world affairs
  2. 7. Land that has not been built on
  3. 12. When people leave cities and move to suburbs or the countryside
  4. 13. When people move to the edge of cities
  5. 15. - The business region of a city
Down
  1. 1. A city with over 10 million people
  2. 2. An unofficial economy - no contracts, cannot be taxed
  3. 4. Redeveloping former industrial areas or housing to improve them
  4. 5. The number of people left after subtracting those leaving from those arriving
  5. 6. The closure of industries
  6. 8. - Communities of migrants who share a similar background
  7. 9. The process of more people moving to towns and cities
  8. 10. - A continuous urban area
  9. 11. A factor encouraging someone to leave their home
  10. 14. Land that has already been built on