<http://webisa.webdatacommons.org/29788509>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/391666681>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/29788509> .
<http://webisa.webdatacommons.org/29788509>	<http://www.w3.org/ns/prov#value>	"Industrial wastes, sewage, use of chemical products, oil spills, and other factors are causing natural water sources to become more and more contaminated." .
<http://webisa.webdatacommons.org/prov/156739132>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/29788509> .
<http://webisa.webdatacommons.org/29788509>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<spahub.com> .