About: http://webisa.webdatacommons.org/215202308

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	Thus the proportion of elements such as carbon, oxygen and iron has slowly grown over the lifetime of the galaxy.
http://www.w3.org/ns/prov#wasQuotedFrom	sciencedaily.com