chapter 7 notes section 3 soil erosion
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Chapter 7 Notes Section 3 Soil Erosion. Use pages to fill in these notes. 1 - Soil erosion is important because losing topsoil affects the way _ plants _ grow. 2 – Many human activities disturb the natural _ balance _ between soil production and soil erosion. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 7 NotesSection 3
Soil Erosion
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1 - Soil erosion is important because losing topsoil affects the way _plants_ grow.
2 – Many human activities disturb the natural _balance_ between soil production and soil erosion.
3 - Agricultural Cultivation: increased farming removes plant cover, leaving soils open to wind & water erosion.
Use pages to fill in these notes.
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4 – Forest harvesting: removes forest which increases erosion & particularly damages tropical rain forest soil.
5 - Overgrazing results when animals graze until almost all ground cover disappears.
6 - Excess sediment can damage the environment when soil erosion is severe.
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We can:(1) manage crops(2) reduce erosion on slopes(3) reduce erosion of exposed soil
How can we prevent soil loss?
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What prevention methods are shown in these pictures?
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Sand TufaPhotograph by Larry Fellows, Arizona Geological SurveyWith the snow-draped Sierra Nevada as a backdrop, unique erosion formations called sand tufa stand like giant cauliflower stalks in a dry Arizona lake bed. Before this alkaline lake went dry, tufa formed when a freshwater spring percolated from below and formed calcium carbonate deposits. When the lake's level dropped, these fragile formations surfaced, and wind went to work removing the sand beneath the deposits.
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FOR MORE INFO, SEE http://www.nationalgeographic.com/topics/erosion/