image: This is a horizontal drill rig capable of drilling one to two miles vertically or horizontally. This image relates to a paper that appeared in the May 17, 2013, issue of Science, published by AAAS. The paper, by Radisav D. Vidic at University of Pittsburgh in Pittsburgh, PA, and colleagues was titled, "Impact of Shale Gas Development on Regional Water Quality." view more
Credit: [Image provided by Susan Brantley]