A dead zone is a region in the ocean that has a level of oxygen too low to support marine life.
Dead zones are typically caused by an excess of nitrogen and phosporus in the water. Although there are some natural processes that can cause this, there are things you can do to prevent the number of dead zones from growing. One of the biggest is the use of chemical fertilizers, which contain nitrogen and phosphorus. As the run-off water ends up in the oceans, it also contains the nitrogen and phosphorus from the fertilizers.
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