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<http://webisa.webdatacommons.org/171966069>	<http://www.w3.org/ns/prov#value>	"The groundwater becomes acidic and dissolves silica and other minerals released from the ash." .
<http://webisa.webdatacommons.org/prov/449648233>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/171966069> .