Question

based on the information provided, what is a \dead zone\?
eutrophication is the process by which a body of water becomes overly enriched with nutrients, leading to excessive plant growth and algae blooms that deplete oxygen in the water. this over - enrichment often occurs due to runoff from land, carrying fertilizers and waste into water bodies. as the algae and plant matter die, they decompose, a process that consumes significant amounts of oxygen, resulting in low oxygen levels in the water. these low oxygen conditions create dead zones, areas in water bodies where aquatic life cannot survive.
for example, algae in a lake might bloom excessively due to high levels of nitrogen and phosphorus from agricultural runoff. this algae then dies and decomposes, a process that consumes oxygen and creates a dead zone. fish and other aquatic life either leave the area or die due to lack of oxygen.

Explanation:

A "dead zone" is an area in a water body created by eutrophication. Excessive plant and algae growth from nutrient - rich runoff depletes oxygen as the matter decomposes, resulting in low oxygen levels where aquatic life cannot survive.

Answer:

A "dead zone" is an area in water bodies where low oxygen levels due to eutrophication make it impossible for aquatic life to survive.