PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • I also do not know much about how metal ores form, but Mercury is the most dense planet out there and likely had (has?) volcanism.
http://www.w3.org/ns/prov#wasQuotedFrom
  • unmannedspaceflight.com