Superlatives

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Across
  1. 3. Oldest population
  2. 5. Highest mountain
  3. 6. Biggest country
  4. 9. Longest river
  5. 10. Coldest place
  6. 12. Hardest mineral
Down
  1. 1. Biggest island
  2. 2. Smallest country
  3. 4. Biggest population
  4. 7. richest country
  5. 8. Biggest continent
  6. 11. Youngest population