geography crossword

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Across
  1. 3. roads built over raised structures
  2. 6. underground roads
  3. 9. movement of people from VILLAGE to CITIES
  4. 10. houses made of ice
  5. 13. carry heavy goods and people over long distances quickly and cheaply
  6. 15. fastest mode of transport
  7. 16. major port of Asia
Down
  1. 1. major port of Europe
  2. 2. one reason for migration
  3. 4. civilisation on river Nile
  4. 5. mode of transport helpful in disasters
  5. 6. one of the world's major port
  6. 7. civilisation on river Indus
  7. 8. cheapest for carrying heavy bulky goods
  8. 11. natural condition for a site
  9. 12. area where people were rescued using airways
  10. 14. one problem of migration