About: http://webisa.webdatacommons.org/241239147

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	Approximately 90 billion tons come from biologic activity in earth???s oceans and another 90 billion tons from such sources as volcanoes and decaying land plants.???
http://www.w3.org/ns/prov#wasQuotedFrom	discovermagazine.com