1. How We Use Land What you should know? How do humans use land as natural resources How logging, farming, and mining affect the land How can lands be logged, farmed, and mined sustainably

2. How We Use Land Vocabulary Natural resources Logging Farming Mining Sustainable

3. Vocabulary Natural resources- Natural substances ( not man made or synthetic) that humans use such as land, water, air, and soil

4. Vocabulary Logging- cutting, and loading of trees or logs onto trucks

5. Vocabulary Farming - the practice of producing and managing food

6. Vocabulary Mining - removal of valuable materials from the earth Examples: coal metals gemstones sand salt gravel

7. Vocabulary Sustainable – using a resource without being completely used up or destroyed

8. How We Use Land Land Use Non Urban FarmingMiningLogging

9. How We Use Land Logging accomplished by Clear cutting “deforestation” Selective cutting Removing all trees in an area without replacing them Mature trees removed and others left alone

10. How We Use Land Clear cutting 1. Least expensive Advantages Disadvantages 1. Increases erosion 2. Decreases beauty of forests 3. Destroys wildlife habitat http://video.nationalgeographic.com/video/news/140827-lemur-babies-vin

11. Selective cutting Disadvantages Advantages 1.Preserves wildlife habitat 2. Humans cut only needed trees 1.More expensive 2. Requires more road building; which can also increase erosion

12. How We Use Land Land Use Non Urban FarmingMiningLogging

13. How We Use Land Chapters 8 and 9 Mining accomplished by Strip miningOpen pit mining Bulldozers used to clear away topsoil to expose valuable minerals Dig large holes in ground and remove ore

14. Minerals removed by mining copper r silver graphite aluminum

15. Disadvantages of mining 1.Wildlife habitat is lost 2.Large scale erosion 3.Toxic substances are left behind seep into drinking water supplies arsenic mercury lead cyanide

16. Responsible Mining 1.Mine Reclamation Law restore mined land to condition it was before mining began 2. Recycle existing products containing copper, aluminum, and iron

17. How We Use the Land Land Use Non Urban FarmingMiningLogging

18. Farming How humans negatively affect farmland Salinization is caused by? Desertification is caused by? Erosion Is caused by?

19. Farming How humans negatively affect farmland Erosion Is caused by? Removal of topsoil during crop harvest Clearing of land to build houses Clearing of forests to produce lumber

20. Causes of erosion urbanization Removal of forests Harvesting crops

21. Farming How humans negatively affect farmland Desertification Is caused by? Overuse of land Several crops plants a year; soil does not rest Trees cut down for fuel More animals are put out to graze than land can support

22. Causes of Desertification

23. Farming How humans negatively affect farmland Salinization Is caused by? Irrigation water contains more salt than rainwater Irrigation water is evaporated by sun leaving salt in soil Plants can not grow when soil becomes too salty

24. Causes of Salinization