About: http://webisa.webdatacommons.org/142414562

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	Pure substances that cannot be broken down into simpler kinds of matter ??? ??? ??? How many elements are there ?
http://www.w3.org/ns/prov#wasQuotedFrom	quizlet.com