| Title | Comment | Keywords |
|---|---|---|
| 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" |
Coastal & Marine Geology InfoBank
USGS CMG InfoBank Geology School: Great Plains |
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