Where are they?
Ocean dead zones are becoming much more prevalent, a study done in 2008 found over 400 dead zones worldwide (Scheer, 2012). Later in 2012 the numbers have only grown since then.
2012 another study found 530 dead zones, a 30% increase in four years (Levitt, 2012) grown since then . The largest and perhaps most well known dead zone is the in the gulf of Mexico. The reason it is so large it because it is where all the water from the Mississippi river drains into the ocean, and with it, all the agricultural waste of 31 states and 2 canadian provinces, making some of the most polluted water in the world (Gulf of Mexico Dead Zone, 2015).
Image of Mississppi river dead zone
(Tripp, 2012)
image of dead fish due to hypoxia
(Wurzbacher, 2011)