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Across 1. Another name for taxes. 3. Dome-shaped houses 5. A narrow strip of land that connects two land massses. 9. Mountains found in South America. 11. Means "place at the falls". 15. The Aztecs and two other cities joined together. 16. Human made islands. 17. Records kept on long folded sheets of paper.

Down 2. An imaginary line on a mountain whre tree don't grow. 4. A series of lakes in northern America. 6. A treeless plain. 7. A huge rocky region in northern Canada. 8. Mountains found in the western United States. 10. Center of Aztec culture and power. 12. A knotted cord used for record keeping. 13. Refers to differences. 14. Level platforms of earth on a hill.