The fracking controversy Hydraulic fracturing, also known as
fracking, is used to extract oil from deep within the earth.
However, there are concerns fracking may contaminate
groundwater. Three unusual earthquakes that shook a suburb west
of Dallas also appear to be connected to the past disposal of
wastewater from local hydraulic fracturing operations, a report
claims. - Photo By REUTERS/Les Stone Sat, 14 Apr, 2012 Photos of
the Day 1 - 3 of 6