History thing

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Across
  1. 5. 'City of Gods'
  2. 6. Great Greek Conquerer
  3. 7. Overuse of Trees
  4. 8. First Chinese Dynasty
  5. 10. A River in Egypt
  6. 11. 21-century Teacher
Down
  1. 1. Southern Supercontinent
  2. 2. Mayan Super-City
  3. 3. 'Head of the house
  4. 4. China's First Emperor
  5. 9. One of Two Quarreling Brothers