What is it called when a lake has no oxygen?

In ocean and freshwater environments, the term hypoxia refers to low or depleted oxygen in a water body. Hypoxia is often associated with the overgrowth of certain species of algae, which can lead to oxygen depletion when they die, sink to the bottom, and decompose.



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Dead Lake is a seasonal mountain lake that may or may not have water in it upon visiting. NPS.

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In all lakes, oxygen is generally low right at the bottom where water meets the lake sediment or mud. This is because there are many bacteria and animals that live and breathe in the sediment. These bacteria and animals decompose dead material that sinks to the bottom and use up oxygen.

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