About: http://webisa.webdatacommons.org/275532909

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	Maintaining a molten core over billions of years requires that it also contain a lighter element, such as sulfur, to lower the melting temperature of the core material.
http://www.w3.org/ns/prov#wasQuotedFrom	nasa.gov