How is hydraulic fracturing “fracking” done?

Hydraulic fracturing (also hydrofracturing, hydrofracking, fracking, or fraccing) is a technique in which rock is fractured by a pressurized liquid. The process involves the high-pressure injection of 'fracking fluid' (primarily water, containing sand or other  suspended with the aid of into a  to create cracks in the deep-rock formations through which will flow more freely. When the removed from the well, small grains 

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