What Is Fracking?

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16.02.2013
MeshokShishek
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http://ngm.nationalgeographic.com/2013/03/bakken-shale-oil/dobb-text

The fracking frenzy in North Dakota has boosted the U.S. fuel supply — but at what cost? Watch this video animation to see how the process of hydraulic fracturing, or fracking, is used to extract oil and natural gas from shale formations deep underground.
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