PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Fracking is a technique utilized by some oil companies to tap oil and natural-gas reserves by using highly pressurized liquids, mostly water and chemicals, to break through shale rock underneath the ground.
http://www.w3.org/ns/prov#wasQuotedFrom
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