About: http://webisa.webdatacommons.org/314610490

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In addition, getting the oil out of the rock is a challenge, requiring cooking or chemical treatment of rock located as much as half a mile under the earth???s surface.
http://www.w3.org/ns/prov#wasQuotedFrom	royaldutchshellplc.com