a) Yahoo!
b) Went to advance search put in water and fracking and contamination. Chose the edu.domain website
c) Osborn, Stephen G, Avener Vengosh, Nathaniel R. Warner, Robert B. Jackson. "Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing." PNAS. vol. 108 no. 20. 17, May 2011. p. 8172-8176. Web. July 2011
d) This site is credible because it is written by respected authors, the article is edited ,was written in a concise manner, it has a bibliography, and was a current article. It showed charts, graphs, and had a fair and balanced approach to the article.
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