<http://webisa.webdatacommons.org/136703417>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/38767993>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/136703417> .
<http://webisa.webdatacommons.org/136703417>	<http://www.w3.org/ns/prov#value>	"Natural events such as volcanoes and solar flares can produce changes in ozone concentration, but man-made changes are of the greatest concern." .
<http://webisa.webdatacommons.org/136703417>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<dot.gov> .
<http://webisa.webdatacommons.org/prov/370958902>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/136703417> .