About: http://webisa.webdatacommons.org/330390467

Property	Value
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	Such low levels of oxygen are believed to be caused by nutrient pollution from farm fertilizers as they empty into rivers such as the Mississippi and eventually into the Gulf, or by soil erosion or discharge from sewage treatment plants.
http://www.w3.org/ns/prov#wasQuotedFrom	prnewswire.com