About: http://webisa.webdatacommons.org/235976291

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	January 23, 2010 Its shell is a composite, made of three layers, each with different properties and made of different minerals.
http://www.w3.org/ns/prov#wasQuotedFrom	scienceblogs.com