Concept
Version 8
Created by Boundless
The Phosphorus Cycle
Dead zones
Dead zones occur when phosphorus and nitrogen from fertilizers cause excessive growth of microorganisms, which depletes oxygen, killing flora and fauna. Worldwide, large dead zones are found in coastal areas of high population density.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Biogeochemical Cycles. October 17, 2013."
http://cnx.org/content/m44889/latest/Figure_46_03_08.jpg
OpenStax CNX
CC BY 3.0.