Apentix/AP Environmental Science/Unit 1: The Living World: Ecosystems/Question

AP Environmental Sciencemediummcq1 pt

A dead zone in the Gulf of Mexico is caused primarily by

A.nutrient runoff fueling algal blooms that deplete oxygen

B.oil spills from offshore rigs

C.overfishing of oxygen-producing fish

D.thermal pollution from power plants

Explanation

Core Concept

Mississippi River nitrogen and phosphorus feed blooms; sinking algae are decomposed by oxygen-hungry microbes, creating hypoxic water where marine life dies.

Correct Answer

Anutrient runoff fueling algal blooms that deplete oxygen

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