Freshwater is used to produce power at

About 77 percent of the freshwater used in the United States in 2005 came from surface-water sources. The other 23 percent came from groundwater. For 2005, most of the fresh surface-water withdrawals, 41 percent, was used in the thermoelectric-power industry to cool electricity-generating equipment.The United States produces a lot of electrical power, and water is important in that production. In 1995, there were about 2,690,000 billion watthours (gigawatt hours) of power produced by thermoelectric power plants (those plants that burn oil, gas, and coal, use geothermal energy, or use nuclear energy).

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.