Stop Fracking & Save Our Water Supply by NoFracking.com
“Hydraulic fracturing is commonly applied to wells drilled in low permeability reservoir rock. An estimated 90 percent of the natural gas wells in the United States use hydraulic fracturing to produce gas at economic rates. The fluid injected into the rock can be water, gels, foams, and compressed gases, including nitrogen, carbon dioxide and air. Various types of proppant are used, including sand, resin-coated sand, and man-made ceramics, depending on the type of permeability or grain strength needed. Sand containing naturally radioactive minerals is sometimes used so that the fracture trace along the wellbore can be measured…” Wikipedia.org
Read More.