About: http://webisa.webdatacommons.org/111795675

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	Especially divalent ions, such as calcium, need to be removed from the water as they strengthen the attachment of the oil to the rock.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org