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Hydraulic fracturing - Wikipedia, the free encyclopedia
Hydraulic fracturing (also fraccing, fracking, hydrofracturing or hydrofracking) is a well-stimulation technique in which rock is fractured by a pressurized liquid.
Oxygen - Wikipedia, the free encyclopedia
General properties; Name, symbol: oxygen, O: Pronunciation / ˈ ɒ k s ᵻ dʒ ə n / OK-si-jən: Appearance: gas: colorless liquid: pale blue: Oxygen in the periodic ...