Bibliography
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Grable, Lisa. "introduction to water what-ifs." Water what-ifs. 1998. Sience junction. 4 Mar 2009- http://www.ncsu.edu/sciencejunction/depot/experiments/water/index.html
Munson, Axler. "Water on the web." Dissolved oxygen, why is it important?. June 12, 2007. University of Minnesota Duluth and Lake Superior College. 6 Mar 2009 http://www.waterontheweb.org/under/waterquality/oxygen.html