Title |
Comment |
Keywords |
Soil Erosion
|
19:20 - 20:45 (01:25) / 2.0 MB
|
"Richard Hazlett", "soil erosion", tropic, "rain forest", "Midwestern United States", "dust bowl", draught, wind, soil, weathering, dust, grassland, agriculture, glacial, plant, crop, topsoil, farming
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Dust Bowl In Retrospect
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20:45 - 21:21 (00:36) / 1.0 MB
|
"Richard Hazlett", weathering, soil, "dust bowl", "U.S. Soil Conservation Service", agriculture, "natural resource"
|
Dust Bowl
|
20:49 - 21:42 (00:53) / 1.1 MB
|
desertification, desert, "United States", "Great Plains", "ecological balance", rainfall, plant, agriculture, grazing, soil, drought, "dust bowl", "soil conservation"
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Geology School Keywords
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