About: http://webisa.webdatacommons.org/59754799

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	The Earth's crust contains metals and metal compounds such as gold, iron oxide and aluminium oxide, but when found in the Earth these are often mixed with other substances.
http://www.w3.org/ns/prov#wasQuotedFrom	frankswebspace.org.uk