RALEIGH, N.C. (AP) — North Carolina lawmakers have given preliminary approval to a measure that would allow fracking for natural gas to begin in the state next year. Fracking, or hydraulic fracturing, is used by the energy industry to extract oil and gas from rock by injecting high-pressure mixtures of water, sand or gravel and chemicals. North Carolina is believed to have natural gas reserves locked in layers of shale under Chatham, Lee and Moore counties, though just how much is in dispute. A separate 2012 study by the N.C.