Part one of term paper
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 gro ...

Part two of term paper
... In some dry areas like Arizona, large cities use groundwater for their entire water supply. Although groundwater is an excellent water source, there are many complications. For example, it is a resource that is difficult to assess since it is not directly visible. Therefor with out complicated measurements, it is hard to say how much water there is left in your well. It is also difficult to tell where exactly the source of recharge for your well is. Thus if an area near your well becomes po ...