This video was done by David Holmes and other talented journalism students at Jay Rosen's NYU's Studio 20. It was part of their collaboration with us to build better explanations for stories. For more on fracking, its lack of regulation, and the potential for drinking water contamination, check out our now nearly three-year running investigation.
Also on MNN:: How does fracking work?
This story originally appeared on ProPublica and is republished here with permission.