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The depletion of which essential element is responsible for the Gulf of Mexico dead zone?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
Which process removes oxygen from water in hypoxic zones?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
About how much land is drained by the Mississippi River?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
What factor determines the boundaries of watesheds?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
Where are dead zones found throughout the world?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
What is the primary culprit behind the dead zone in the Gulf of Mexico?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
What boundary divides water between the Pacific and Atlantic Oceans in North America?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
What is hypoxia?
elevation
oxygen
agricultural chemicals
in many places worldwide
a condition of oxygen depletion in water
Continental Divide
decay of phytoplankton
40 percent
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