Web Site # 3 (gov)

a) Yahoo!

b) I put in fracking (water or contamination ) . gov

c) United States. Cong. Senate. Cardin, Ben. "Cardin Calls for GAO Study of Hydraulic Fracking."  28 June  2011.  Web. July 26, 2011. <cardin.senate.gov/...for-gao-study-of-​hydraulic-fracking>

d)  This site is credible because it uses a current date and it is posted by a reliable author the US Senator of Maryland.  It is a unbiased article explaining the pros and cons of drilling for gas in a responsible manner. It is also educating the public as to what is going on with fracking.