About: http://webisa.webdatacommons.org/167895887

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	unequal hardness and resisting power, from clays and sands to the various kinds of rock.
http://www.w3.org/ns/prov#wasQuotedFrom	wku.edu