different between hydrofracking vs hydrocracking

English

hydro- +? fracking

hydrofracking (uncountable)

hydraulic fracturing
- 2011, New York Times, 2011-04-17.[1]
  The chemicals were used by companies during a drilling process known as hydraulic fracturing, or hydrofracking, which involves the high-pressure injection of a mixture of water, sand and chemical additives into rock formations deep underground.

hydro- +? cracking

hydrocracking (usually uncountable, plural hydrocrackings)

(organic chemistry) the production of high-octane petroleum fuel and kerosene by hydrogenating large or complex hydrocarbons and then cracking them.

hydrocracking

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