About: http://webisa.webdatacommons.org/82733792

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	Although coal is mainly composed of carbon, it contains impurities such as sulfur and nitrogen atoms.
http://www.w3.org/ns/prov#wasQuotedFrom	uiuc.edu