About: http://webisa.webdatacommons.org/259584240

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	Since iridium is a metal which has very low abundance on earth, they attributed the excess iridium to a impact of a 10-kilometer diameter asteroid.
http://www.w3.org/ns/prov#wasQuotedFrom	lbl.gov