A world of difference...

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Across
  1. 1. Second largest producer of wine
  2. 3. National sport of Brazil
  3. 5. Persepolis Football Club is located in this country
  4. 6. Country where slurping is complimentary
  5. 8. An Arab name for market
  6. 12. Country with world's highest waterfall
  7. 13. Most linguistically diverse continent
  8. 15. Most diverse country
Down
  1. 2. Largest producer of oxygen
  2. 4. Most popular language in the world
  3. 7. Currency of Mongolia
  4. 9. Country with more lakes than the world combined
  5. 10. Currency of Nigeria
  6. 11. Referred to as the warm heart of Africa
  7. 14. National flower of Italy