About: http://webisa.webdatacommons.org/247369842

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	But until about two billion years ago, Earth's atmosphere was mostly carbon dioxide, sulfur dioxide and nitrogen; only about one-tenth of 1 percent was oxygen.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org