What is the primary culprit behind the dead zone in the Gulf of Mexico?

The depletion of which essential element is responsible for the Gulf of Mexico dead zone?

About how much land is drained by the Mississippi River?

How do excess nutrients in the Gulf of Mexico affect phytoplankton?

What factor determines the boundaries of watesheds?

What is hypoxia?

Which process removes oxygen from water in hypoxic zones?

Which of the following would help reduce the dead zone in the Gulf of Mexico?

What boundary divides water between the Pacific and Atlantic Oceans in North America?

Where are dead zones found throughout the world?

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