About: http://webisa.webdatacommons.org/323797273

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	Since iron is an extremely common metal used for many purposes, such as building construction, doors, fencing materials, ships hulls, bolts, screws, and nails, considerable effort is spent trying to keep iron from rusting.
http://www.w3.org/ns/prov#wasQuotedFrom	ck12.org