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| Description: Native prairie grasses originally held erosion-prone soils in place 1879-1929: Widespread cultivation of wheat, and grazing of many thousands of cattle Great Depression brought a cycle of poverty and overly intensive agricultural practices Dust storms (black blizzards) travelled up to 2000 km Lung irritation, dust pneumonia, grasshopper infestations Picture Stats: Views: 237 Filesize: 62.88kB Height: 436 Width: 684 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35729 |