About: http://webisa.webdatacommons.org/164887438

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	A calcium or magnesium metal base such as magnesium oxide, calcium oxide, or calcium carbonate is often used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com