<http://webisa.webdatacommons.org/131776851>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/131776851>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<differencebetween.info> .
<http://webisa.webdatacommons.org/prov/297738889>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/131776851> .
<http://webisa.webdatacommons.org/131776851>	<http://www.w3.org/ns/prov#value>	"Chemicals such as reducing agents are used to wash out other elements from ores into gases or slag (waste); this leaves just the metal behind." .