Environmental
Iowa's agricultural use of nitrogen fertilizers has contributed to which major water quality issue in the Gulf of Mexico?
AAcid rain
BHypoxic (dead) zones caused by nutrient runoff✓ Correct
CMercury contamination
DSaltwater intrusion
Explanation
Nitrogen and phosphorus from Iowa agricultural runoff contribute to hypoxic (oxygen-depleted) dead zones in the Gulf of Mexico via the Mississippi River. Iowa's Nutrient Reduction Strategy aims to address this.
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