Across
- 4. a computerized system for storing, manipulating, and viewing geographic data
- 7. the process by which land in arid or semiarid areas becomes more desert-like because of human activity or climate change
- 9. the process by which trees are planted to re-establish trees that have been cut down
- 11. Movement of people from rural areas to cities
- 12. the surface layer of soil which is usually richer in organic matter than the subsoil
- 13. damage to rangeland that comes from allowing more animals to graze in an area than the range can support
- 14. land that contains relatively few people and large areas of open space
- 15. rapid expansion of a city into the countryside around the city
Down
- 1. land that can be used to grow crops
- 2. partly decomposed organic material
- 3. the increased temperature in a city
- 5. determining in advance how land will be used
- 6. the things that a society builds for public use
- 7. the clearing of trees from an area without replacing them
- 8. land that is covered mainly with buildings and roads
- 10. an area in which the land and the ecosystem it supports are protected from exploitation