About: http://webisa.webdatacommons.org/69304083

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	To obviate this problem, which is in particular present when cementing wells that penetrate underground formations located below a body of water, such as a sea or ocean, so-called lightweight cements have been developed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es