Eutrophication

[Marquetta]

Depletion of oxygen in water:
The process by which a body of water becomes rich in [dissolved] nutrients from fertilizers or [sewage], thereby encouraging the growth and decomposition of oxygen-depleting plant life and resulting in harm to other [organisms].

[Justin Bieber]

Excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant life.

[Zipporah Schumaker]

the addition of nutrients to water in lakes and rivers, which encourages plant growth that can take oxygen from the water and kill fish and other animals: