What are "dead zones" in bodies of water?

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Dead zones are areas in bodies of water, such as oceans, lakes, and rivers, that contain extremely low levels of oxygen, making it difficult for aquatic life to survive. These areas typically form when excess nutrients, such as nitrogen and phosphorus from agricultural runoff or sewage treatment plants, cause an overgrowth of algae. As these algae die and decompose, they consume oxygen, creating a condition called hypoxia, where oxygen levels are too low to support most life forms.

What Are "Dead Zones" in Bodies of Water