Question

consider the images showing hypoxic areas of the gulf of mexico and the graphs of river nitrogen. describe the correlation between the nitrogen levels in the cedar and mississippi rivers and the seasonal dead zone in the gulf of mexico. there doesnt appear to be a connection as the high nitrogen levels in the cedar river do not occur at the same time as the greatest hypoxia in the gulf of mexico. the excess nitrogen in the upper midwest flows down the mississippi river in late spring and early summer which results in the summer seasonal algal blooms in the gulf of mexico.

Explanation:

Excess nitrogen from the upper Midwest carried by the Mississippi River in late - spring and early - summer causes summer seasonal algal blooms in the Gulf of Mexico, which is related to the formation of the Dead Zone. High nitrogen levels in the Cedar River not being concurrent with the greatest hypoxia in the Gulf doesn't mean there is no connection overall as the Mississippi is the major contributor here.

Answer:

The excess nitrogen in the upper Midwest flows down the Mississippi River in late spring and early summer which results in the summer seasonal algal blooms in the Gulf of Mexico.