About: http://webisa.webdatacommons.org/217009895

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	Rocks are cheap for building thermal mass, and water is a good choice because it is cheap, holds heat, and is readily available.
http://www.w3.org/ns/prov#wasQuotedFrom	dummies.com