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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	CC BY-NC-ND by fridgeirsson, via Ars Electronica on Fickr.In order to get a better idea of what was going on, the researchers took multiple samples of mostly ash, and each sample could be dated to a particular day of the eruption.
http://www.w3.org/ns/prov#wasQuotedFrom	science20.com