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Hydraulic fracturing creates small cracks, or (FRACKING) fractures, in deep, underground geological formations to liberate oil or natural gas. The fluids that create the initial fractures is then mixed with thicker fluids that include sand and gelatin. These more compressed fluids lengthen the openings in the rock. When the fractures are complete, and pressure is relieved, the fluids flow back up the well where they are captured and stored for later treatment or disposal. https://www.fracnews.com/tag/fracking/