About: http://webisa.webdatacommons.org/235859632

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	Sandstone and shale are mostly silica, but the limestone represents the carbon dioxide that was once present in the atmosphere.
http://www.w3.org/ns/prov#wasQuotedFrom	du.edu