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What Is Hydraulic Fracturing?
This graphic explains hydraulic fracturing to extract natural gas, which "involves the injection of more than a million gallons of water, sand and chemicals at high pressure down and across into horizontally drilled wells as far as 10,000 feet below the [earth's] surface." Includes a brief description of natural gas extraction from the Marcellus Shale in New York, Pennsylvania, and southern Appalachia. From ProPublica, a nonprofit investigative journalism newsroom.
http://www.propublica.org/special/hydraulic-fracturing
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