About: http://webisa.webdatacommons.org/314350156

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	In their natural state, they are covered with mud, sand, gravel and other impurities.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com