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acre acre-feet acre-foot Africa America amount of water animals arid lands August von Kreling average bacteria basin blood blood plasma body camel Cannonsville Reservoir cattle cities cloud coastal Colorado Colorado River contain cool cost crops crystals cud chewer desert detergents diet digestive dissolved drain drinking water droplets earth erosion evaporation farmers feet fish flood flow forest fresh water fresh-water grass grow half heat human inches irrigation kangaroo rat kidneys lake Lake Mead less liquid living man's marshes meat million moisture molecules mountain Nile ocean oxygen percent person plants pollution pond population pounds produce protein pure water rain tree rainfall reach reservoirs rice river salt sea water sewage silver iodide skin slopes sodium-ion soil square miles streams supply surface sweat temperature thirst tion urea urine vegetation warm wastes water molecule waterfowl wetlands wind