U.S. and Canada

3. farming A farming method used in dry regions in which crops are grown that rely only on the natural precipitation
4. A large population concentration made up of several large and many smaller cities, such as the area between Boston and Washington D.C.
7. A high point or ridge that determines the direction rivers flow
10. A small river or stream that feeds into a larger river
11. Public services or systems such as power, water, sewage, transportation, communication, networks, school, and healthcare
12. The source of a stream or river
15. Economy that emphasizes services and technology rather than industry and manufacturing

1. Movement towards cities
2. line A boundary in the eastern United States where higher land of the Piedmont drops to the lower Atlantic Coastal Plain
5. A mild climate region in the southern and southwestern portions of the United States
6. A channel or pipeline for carrying a large quantity of flowing water
8. A large, powerful windstorm that forms over warm ocean waters
9. belt A farming method used in dry regions in which crops are grown that rely only on the natural precipitation
13. fuel A resource formed in the Earth by plant and animal remains
14. Sprawl The unplanned and uncontrollable spread of urban settlements into neighboring regions