About: http://webisa.webdatacommons.org/221472313

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	You never have to add it again.So what is this miracle substance?Shale is a sedimentary rock: hardened layers of clay, silt and other minerals ??? essentially very old mud.
http://www.w3.org/ns/prov#wasQuotedFrom	denverpost.com