Definition from Wikipedia:
"Hydraulic fracturing (also fracking, fraccing, frac'ing, hydrofracturing or hydrofracking) is a well stimulation technique in which rock is fractured by a pressurized liquid. The process involves the high-pressure injection of 'fracking fluid' (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore to create cracks in the deep-rock formations through which natural gas, petroleum, and brine will flow more freely."
It is already wellknown that fracking causes/triggers earthquakes!!!
IMHO, the big question is, though, could it, also, cause/trigger a much bigger problem, or not???
What if, fracking could also dissolve deep bedrock (under a large area/city) & cause/trigger a GROUND COLLAPSE event???!!!
IMHO, what needs to be done, URGENTLY, for geology scientists, is to do, as many as possible/needed, extremely accurate/detailed experiments (using all kinds of bedrocks (& ground layer structures) involved in real world fracking) & extremely accurate/detailed computer simulations, to really PROVE, if, any type/scale of fracking, done anywhere in the world, could really, eventually, cause/trigger, a (large scale/area) GROUND COLLAPSE event, or not???!!!
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