hydraulic fracturing

Feeling the earth move under one's feet can be unsettling, even in places where it's a natural and fairly common occurrence. But far more disconcerting is when major tremors in places unaccustomed to earthquakes can be traced to human causes like fracking.

Please pardon my poor punning, and let me explain: "Fraccing" (rhymes with "cracking") is the oil and natural gas industry's an informal contraction for the technology called hydraulic fracturing, in which water (and in some cases, a chemical mixture) is pumped deep underground to fracture shale...