pg.8
Where do dead zones ocur?
Dead zones commonly occur near agriculture because of the runoff, and in salt or freshwater bodies of water. Common places include Lake Eerie, Chesapeake Bay, northern gulf of Mexico, and Baltic Sea. Dead zones are classified into four different scientific categories.
Permanent - is in deep water, so deep that oxygen only rises about 2 miligrams per liter
Temporary - exists for hours or days
Seasonal - occurs every year only during warm months
Diet Cycling - occurs in warm months only during night time
permanent(Venezuela, Black Sea, Norway)
temporary(Oregon Coast, Oregon)
diel cycling(Waquoit Bay)
seasonal, chesapeake bay
by MMarks
wikimedia
water liberity
newswer
smugmug