About: http://webisa.webdatacommons.org/101032741

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	The homogeneity of the methane/air mixture can vary depending on the elevation and the methane liberation of the sealed area and outside factors such as the temperature and barometric pressure.
http://www.w3.org/ns/prov#wasQuotedFrom	msha.gov