Across
- 4. a system for ranking members of a group according to their importance.
- 6. to help bring out
- 7. a very long mountain range along the western edge of South America
- 10. the result of multiplying one number to another
- 11. strips of level land that are planted with crops
- 12. accuracy
Down
- 1. expected
- 2. people who move from place to place without a permanent home
- 3. to change the growth of plants of behavior of animals in ways that are useful to humans.
- 5. a group of related families that pooled resources
- 8. a record-keeping device made of knotted strings
- 9. Incan system of paying taxes with labor