<http://webisa.webdatacommons.org/29670215>	<http://www.w3.org/ns/prov#value>	"Underground caves in limestone can be formed by a reaction including A." .
<http://webisa.webdatacommons.org/29670215>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/472501492>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/29670215> .
<http://webisa.webdatacommons.org/29670215>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<proprofs.com> .