![]() ![]() Understanding the eutrophication process provides the clearest picture of how and why dead zones develop. For this reason, dead zones are often located near inhabited coastlines. Human activities are the main cause of these excess nutrients being washed into the ocean. With too many nutrients, however, cyano bacteria grows out of control, which can be harmful. At normal levels, these nutrients feed the growth of an organism called cyanobacteria, or blue-green algae. Dead zones occur because of a process called eutrophication, which happens when a body of water gets too many nutrients, such as phosphorus and nitrogen. ![]() That is why these areas are called dead zones. Because most organisms need oxygen to live, few organisms can survive in hypoxic conditions. Dead zones are low- oxygen, or hypoxic, areas in the world’s oceans and lakes. ![]()
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