Hint
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Answer
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Creation of Soil
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500 years to make 1 inch of topsoil can be easily lost to erosion -> qualifies as nonrenewable, agriculture needs around 6 in of topsoil, in the past 40 years, lost 1/3 of crop land bc of soil degredation
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Lost Topsoil
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ends up water ways, increase in water pollution, increase in turbidity, less light gets in, less photosynthesis for plants
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Soil Ecosystem
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bacteria fix nitrogen, fungi on tree roots help w/ absorption, decomposer break down leaf litter, organisms mix soil, animals burrow -> aeration, animal feces fertilize soil
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General ways we modify soil
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fertilizer, liming -> add base to neutralize acid, deforestation -> increase in erosion and compaction, more water runoff
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Ways we negatively affect fertility
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deforestation, overgrazing, urbanization, irrigation, monoculture
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Causes of soil degradation
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overgrazing, deforestation, agriculture, fuelwood gathering (using trees to make charcoal)
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Soil Conservation Methods
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contour plowing, cover crops, no-till, strip-cropping, terracing, shelterbelt/windbreak
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Other Soil conservation measures
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soil conditioning, planting leguminous plants, crop rotation, forestation/ reforestation
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