Answer :
A dead zone is a massive volume of water with low dissolved oxygen content and also they do not have enough oxygen for marine life and kill animals that can not move to less polluted areas.
What is dead zone?
In the Gulf of Mexico, dead zones lasts from spring and until fall, when the storms churn the water and redistribute oxygen.
The resulting low oxygen levels near the bottom of the Gulf cannot support marine life. Fish, shrimp and crabs swim out of the area, but animals that are unable to swim are killed by the low oxygen.
Dead zones occur because of a process that is called eutrophication, that occurs when a body of water gets too many nutrients like phosphorus and nitrogen.
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