A rig drills for natural gas at a hydraulic fracturing site owned by EQT Corp. located atop the Marcellus shale rock formation in Washington Township, Pennsylvania, U.S., on Thursday, Oct. 31, 2013. Output from shale deposits including the Marcellus has surged 10-fold since 2005 to account for a third of the countrys gas production, government data show. The increase in production is bringing development to an economically depressed region that lies atop the Marcellus shale, a rock formation that produces more natural gas than Saudi Arabia. Photographer: Ty Wright/Bloomberg via Getty Images
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