<http://webisa.webdatacommons.org/89860354>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<teachengineering.org> .
<http://webisa.webdatacommons.org/prov/38022256>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/89860354> .
<http://webisa.webdatacommons.org/89860354>	<http://www.w3.org/ns/prov#value>	"Two of the most common and most dangerous of these metals are mercury and arsenic." .
<http://webisa.webdatacommons.org/89860354>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/37730808>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/89860354> .