| http://www.w3.org/ns/prov#value | - The process has been used more than a million times in the past half century, especially in Texas and Oklahoma where it was first utilized.Casey says fracking often occurs near underground sources of drinking water and involves the use of pollutants that may contaminate the water, such as salt, arsenic, and heavy metals.???The issue is especailly relevant to Pennsylvania, according to Casey, bec
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