Hard geography crossword

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Across
  1. 3. world's fourth most populous country
  2. 5. world's largest island
  3. 8. Oceania's tallest mountain
  4. 9. world's most populous country
  5. 10. world's longest river
  6. 12. country with highest life expectancy
  7. 14. world's densest city
  8. 16. Europe's tallest mountain
  9. 17. tallest twin tower complex in the world
  10. 18. country with lowest life expectancy
Down
  1. 1. world's third most populous country
  2. 2. Africa's tallest mountain
  3. 4. country with the worst human rights record
  4. 6. world’s largest country by area
  5. 7. north America's tallest mountain
  6. 11. world's second most populous country
  7. 13. largest city in the world by population
  8. 15. tallest building in the world