<http://webisa.webdatacommons.org/prov/425215104>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/208884541> .
<http://webisa.webdatacommons.org/208884541>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<chesapeakebay.net> .
<http://webisa.webdatacommons.org/208884541>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/208884541>	<http://www.w3.org/ns/prov#value>	"This raises surrounding acidity levels and lowers carbonate ion levels, making it harder for oysters and other shellfish to produce the calcium carbonate needed to form their shells." .