Countries and Worst Years

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Across
  1. 2. 10,000,000,000 BC
  2. 3. 1,000,000,000 BC
  3. 7. 100,000 BC
  4. 9. 1,000,000,000,000 BC
  5. 11. 750,000,000,000 BC
  6. 12. 750,000 BC
  7. 13. 10,000,000 BC
  8. 15. 100,000,000 BC
Down
  1. 1. 500,000 BC
  2. 4. 999,999,999,999 BC
  3. 5. 250,000,000,000 BC
  4. 6. 100,000,000,000 BC
  5. 8. 500,000,000,000 BC
  6. 10. 250,000 BC
  7. 14. 1,000,000 BC