About: http://webisa.webdatacommons.org/301513342

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	Water is considered ???hard??? when it has a high concentration of dissolved minerals such as calcium, magnesium, gypsum, and other salts.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.com