http://wwwga.usgs.gov The U.S. Geological Surveys Water Science for Schools site has some answers about rivers and the landscapes. Tells how rivers and streams begin their lives as smaller creeks, often called ",the headwaters",. These small tributaries run downhill until they merge to form bigger tributaries which continue merging to form larger rivers which flow towards the oceans.
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http://www.glerl.noaa.gov/ GLERLs mission is to conduct integrated, interdisciplinary environmental research in support of resource management and environmental services in coastal and estuarine water, with special emphasis on the Great Lakes and their research provides Federal, State, and international decision and policy makers with scientific understanding of pathways, fates, and effects of toxicants in the Great Lakes, natural hazards such as severe waves, storm surges, and ice, ecosystems and their interactio
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