Which year are you in? <a href=" http://www.teamjolokia.com/best-prescription-drugs-for-ocd.pptx#unfriendly ">co op pharmacy prescription delivery</a> Over the last five years, advances in technology have led to a surge of drilling in states such as Pennsylvania, Colorado, Arkansas and North Dakota. Previously inaccessible deposits of shale oil and gas have been unlocked by fracking, a process in which large amounts of water and sand along with chemicals are injected deep underground to break apart the rock.