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<http://webisa.webdatacommons.org/prov/222358233>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/109578885> .
<http://webisa.webdatacommons.org/109578885>	<http://www.w3.org/ns/prov#value>	"Parker said as sulfur dioxide has time to spread and move across land, it reacts with water vapor and other elements to create sulfate, which is less corrosive." .