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This web page introduces the concepts of density and buoyancy. The discovery in ancient Greece by Archimedes is described. The densities of various materials are given and temperature effects introduced. Links are...
Simple description of the chemical and physical properties of water produced by the U.S. Geological Survey.
From the USGS Water Science for School's web site comes this color coded map of public-supply water use. Each state's daily water withdraws from all sources is shown.
From the USGS Water Science for School's comes this information on what wastewater is and why it is treated, by looking at the potential ways it can affect fisheries, wildlife habitats, recreational sites, and human...
From the USGS Water Science for School's web site is a comparison of the disadvantages to power plants that use coal and oil to the advantages of hydroelectric power.
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