About: http://webisa.webdatacommons.org/211301503

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	This varies by where the wood was (trunk vs. branch), but wood ash from most kinds of trees has up to 4% silica.
http://www.w3.org/ns/prov#wasQuotedFrom	teachat.com