Physical Geography

3. A resource formed in the Earth by plant and animal remains.
5. A physical feature that determines the direction a river flows.
7. Growth that does not deplete the human and natural resources of a given area.
10. How close people are living together.
13. A boundary in the eastern USA where the higher land of the Piedmont drops to the lower Atlantic Coastal Plain.
14. One of Canada's most important rivers and forms part of the border between the USA and Canada.
16. A large, powerful windstorm that forms over warm ocean waters.

1. The unplanned and uncontrollable spread of urban settlements into neighboring regions.
2. The source of stream or river.
4. Series of canals that connect the Great Lakes to the Atlantic Ocean.
6. Movement towards cities (jobs).
8. Formed by glacier basins that were filled with freshwater.
9. A smaller river or stream that feeds into a larger river.
11. A high ridge in the Rocky Mountains.
12. The things that help a country function like transportation, plumbing, sewage systems, etc.
15. Key source of hydroelectric power (on the border between USA and Canada).