geography crossword

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