How does eutrophication cause dead zones?

Eutrophication is a process in which an water body, partially or fully becomes enriched with minerals and nutrients over time

Dead zones are caused by eutrophication as it will deprive water bodies of oxygen, replacing it with phosphorus and nitrogen. As such few organisms can survive in a hypotonic environment as oxygen is needed to function.

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Conservation of Biodiversity
• UPSC Environment and Ecology