About: http://webisa.webdatacommons.org/79133204

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	Sludge is a thickening of the oil because moisture and contaminants build up and break down the oil, causing it to gel.
http://www.w3.org/ns/prov#wasQuotedFrom	autosafety.org