The amount of dissolved oxygen in water may decrease because of the

Question

aaronq · Answer

Higher temperatures

anonymous · Answer

Turbid or cloudy water may have lower oxygen levels
Shallow water holds less dissolved oxygen
Warm water holds less dissolved oxygen than cold water
Decreasing barometric pressure can release oxygen out of a solution

goformit100 · Answer

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anonymous · Answer

Increase of algae (algae bloom) or other organisms such as fish