About: http://webisa.webdatacommons.org/268369008

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	Ages of such rocks are determined by measuring the amount of a radioactive element, such as uranium (the parent), and the element it decays to, in this case, lead (the daughter).
http://www.w3.org/ns/prov#wasQuotedFrom	hawaii.edu