About: http://webisa.webdatacommons.org/362420975

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 different materials, brick, marble, granite and four different types of concrete, all have distinct densities and concentrations of radioactive elements.
http://www.w3.org/ns/prov#wasQuotedFrom	physicscentral.com