留言内容:What do you like doing in your spare time? http://al4a.fun/ al4a Wastewater is a by-product of hydraulic fracturing, known asfracking, which involves pumping millions of gallons of water,sand and chemicals deep underground to fracture shale rock andrelease oil and gas. Much of the water returns to the surfaceafter fracking is complete, and is often placed in holding tanksfor recycling.