<http://webisa.webdatacommons.org/prov/45341217>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/151925772> .
<http://webisa.webdatacommons.org/151925772>	<http://www.w3.org/ns/prov#value>	"Environment??current issues:water pollution in the form of heavy metals, organic compounds, and nutrients such as nitrates and phosphates; air pollution from vehicles and refining activities; acid rain" .
<http://webisa.webdatacommons.org/prov/50267192>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/151925772> .
<http://webisa.webdatacommons.org/151925772>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/151925772>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<bartleby.com> .