1. Environmental Science Chapter 8 Land Use Notes #2

2. Chapter 8 : Land How we Use Land  Harvesting trees Paper, furniture, homes, etc. Also to gain area for farming US uses over 3.5 times as much as the rest of the world  Deforestation Clearing trees from an area without replacing them  Rain Forests  Reforestation Replace trees that are dead or removed

3. Chapter 8 : Land How we Use Land  Examples of Deforestation Clear-cutting  Removes all trees  Destroys wildlife habitat  Increases soil erosion Selective cutting  Only take old/mature trees  Least impact on environment  Removes trees in clumps Roads used for logging are the main source of soil erosion

4. Chapter 8 : Land How we Use Land  Ranching Land used for grazing Shrubs and grasses Adaptable plants (native V. invasive) Overgrazing  Desertification

5. Chapter 8 : Land How we Use Land  Ranching Maintenance  Public rangelands improvement act of 1978 2 main points Maintenance and improvement  Limiting herd size  Fencing off overgrazed, many water holes

6. Chapter 8 : Land How we Use Land  Mining Mineral–solid element or compound (Ag,Au,NaCl) Useful Minerals – mineral resources (Fe, Cu, Al)  Found in Ores Open Pit Mining (Quarries)  Machinery digs big holes Strip mining  Bulldozes strips away layers

7. Chapter 8 : Land How we Use Land  Mining Reclamation Restoring land that has been mined Public mining sites must be reclaimed  Recycling reduces the need for mining State and federal agencies create policies that regulate mining Fines get issues by state agencies if protocol isn’t followed.

8. Chapter 8 : Land How we Use Land  Public Land US Citizens are the owners of public lands National Parks (Yellowstone)  Preserve scenery, wildlife habitats, provide ecological services  About 55 nat’l parks in the US Endangered Species Act  Protecting habitats