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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b. to discover aspects of the natural world.

hopefully i .

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers