hydraulic fracturing
noun/haɪˌdrɒlɪk ˈfræktʃərɪŋ/
/haɪˌdrɔːlɪk ˈfræktʃərɪŋ/
[uncountable] (formal or specialist)- fracking (= the process of forcing liquid at high pressure into rocks, deep holes in the ground, etc. in order to force open existing cracks and take out oil or gas)
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hydraulic fracturing