Unit 7
Across
- 1. Type of forest that has not been seriously disturbed for several hundred years.
- 6. Removal of trees to clear space for agriculture, urbanization, or for timber
- 7. Type of fire where lots of undergrowth allows fire to burn very hot and spread quickly from tree top to tree top, most damaging
- 9. Prolonged period of consistently below average rainfall
- 10. Type of forest growth resulting from natural secondary succession
- 11. Parks and large areas of forest left in and around developments
- 12. Desalination by boiling water, capturing the steam, and allowing it to condense
- 14. Land degradation severe enough that land becomes desert, unable to support vegetation
- 16. When Cities fall apart, physically and socially, as people migrate to suburbs reducing city revenue generated from taxes.
- 17. low population density communities that are not directly connected to the metropolitan area
Down
- 2. Large expanses of undeveloped land covered mostly with grasses or brush suitable for grazing livestock but too dry to farm
- 3. When usage exceeds the supply or poor quality of water makes it unusable for human needs
- 4. Removing salt from ocean water or brackish water to get fresh water
- 5. When the urban area expands outward into the rural surroundings and forms 2 types of communities
- 8. Type of fire that smolders underground burning up humus and soil microbes for days or weeks and are hard to put out.
- 13. Type of fire that only burns underbrush, little damage to mature trees, beneficial
- 15. Low population density areas outside the city