Dead Zones

What are dead zones? How are they formed? And what effect do they have on aquatic environments? How can dead zones affect humans? What can humans do about the issue? https://oceanservice.noaa.gov/facts/deadzone.html Go to a pet or fish store and make observations about the environment of the tanks in which the fish are located. Make a concept map that shows the causal relationship between the oxygen cycle and dean zones.

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