About: http://webisa.webdatacommons.org/7212333

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	Silica, a mineral from volcanic ash, seeped into the trees??? tissue and, like a pushy houseguest, replaced the wood with quartz colored by such minerals as iron and manganese.
http://www.w3.org/ns/prov#wasQuotedFrom	washingtonpost.com