Across
- 3. a source
- 4. Growth that does not deplete the human and natural resources of a given area
- 6. Various bodies of water join in
- 8. a series of canals that connect the Great Lakes to the Atlantic Ocean
- 12. a key source of hydroelectric power
- 13. a high ridge in the Rocky Mountains
Down
- 1. the things that help a country function
- 2. a nation or territory considered as an organized political community under one governmen
- 5. the unplanned and uncontrollable spread of urban settlements into neighboring regions
- 7. ormed by glacier basins that were filled with freshwater
- 9. movement toward cities
- 10. is a physical feature that determines the direction a river flows
- 11. a principal administrative division of certain countries or empires