Slick water and black shale in fracking do not combine to produce radioactive waste. Fracking, also known as hydraulic fracturing, is a process used to extract natural gas and oil from underground rock formations. Slick water is a mixture of water and chemicals used to lubricate the drill bit and transport fracking sand to the target formation. Black shale is a type of sedimentary rock that contains a high percentage of organic matter. While black shale can contain radioactive elements such as uranium and thorium, these elements are not released during the fracking process.