BoingBoingBowen's Puzzle

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Across
  1. 3. People known for their ancient temples.
  2. 5. Citadel
  3. 6. Study of the human past
  4. 9. Successively receding flat surfaces
Down
  1. 1. Ruled an empire that extended across the pacific coast
  2. 2. Talking knots
  3. 4. A pipe of passage
  4. 7. Islands used for agriculture purposes
  5. 8. People that lived in central Mexico