yippee!! prehistory!! (really specific just for me tbh)

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Across
  1. 4. violent findings
  2. 5. inca record system
  3. 8. ‘theory’ by a sci-fi author
  4. 10. mysterious disappearance of a society
  5. 12. small ancestor*
  6. 13. birthplace of man
  7. 14. distant cousin
  8. 15. *ancestor’s burial ground
  9. 17. birthplace of the olympics
  10. 18. us!
Down
  1. 1. gave us man’s best friend and livestock
  2. 2. maiden’s resting place
  3. 3. often regarded as the first civilization
  4. 6. destroyer of pompeii
  5. 7. something you can name after yourself—if you find one
  6. 9. buried with a sickle across the neck
  7. 11. survival before farming
  8. 16. _ and euphrates