Across
- 6. salt buildup in soil
- 10. area where a lot of corn is grown
- 12. electricity produced by moving water
- 14. chemicals in air pollution; can damage trees when falls
- 15. area where factories were once used and have been left to rust
- 16. go across the hill, rather than up and down
- 17. mountain chain on the western side of the United States
- 18. thinking your culture is above all others
- 21. area where a lot of milk and cheese are produced
Down
- 1. major cities and suburbs combine into one giant urban area; located on the east coast (New York City, Boston, Philadelphia)
- 2. from ancient plant and animal remains; coal, natural gas
- 3. imaginary line where rivers either go toward the Atlantic or Pacific Oceans
- 4. heat of Earth's interior
- 5. soil nearly useless for farming
- 7. mountain chain on the eastern side of the United States
- 8. area in California where many technology companies are located
- 9. loss of forests
- 11. ships have access from the ocean to the Great Lakes
- 13. water is artificially supplied to the land
- 19. planting different crops in alternating years
- 20. artificial channels for transporting water