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Beginning of Paper
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INTRODUCTION
Although 70 percent of the Earth's surface is covered by water, 97 percent of it is contained in the oceans and is too salty to drink (Cunningham and Saigo, 1992). Therefor, fresh water is a precious resource that in some areas of the world is so scarce, that people will fight wars over it. About 25 percent of the world's fresh water is groundwater. Although groundwater is no ....
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Middle of Paper
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.... the many uses of groundwater in agriculture as well as environmental problems that are presently threatening the quantity and quality of groundwater reserves.
THE WATER CYCLE
The water cycle is a constant movement of water in the air, in the ground and on the surface of the Earth. It starts when water evaporates from plants, the ground, lakes, rivers and oceans. This is called evapotranspiration.
As the vapor rises, the surrounding air gets colder and colder. The de ....
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ADDITIONAL FEATURED ESSAYS
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