Population Density

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Across
  1. 4. To be alone
  2. 7. To bring water into a place
  3. 8. Poorer part of Hong Kong
  4. 9. To dirty a place
  5. 10. People who live on streets
  6. 15. Boats which people live on
  7. 16. For there to be very little space
Down
  1. 1. Too many people in one place
  2. 2. Largest hot desert, in Africa
  3. 3. Many people live in this in a place with high population density
  4. 5. High apartment buildings
  5. 6. Richest part of Hong Kong
  6. 11. The making of deserts
  7. 12. Surrounded by land
  8. 13. Slum in India
  9. 14. River in India
  10. 17. Poor place in India with high population density