About: http://webisa.webdatacommons.org/21145844

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	This layer is made of more dense, pressure resistant, 4 billion-year-old ???ultramafic??? minerals and rocks that are low in plant-nurturing calcium, potassium and other minerals, and high in things like magnesium, nickel and cobalt.
http://www.w3.org/ns/prov#wasQuotedFrom	davisenterprise.com