Ohio Fertilizer Applicator Certification Practice Test

What was the largest recorded size of the Gulf of Mexico hypoxic zone?

About 2,000 square miles in 2010 About 5,000 square miles in 2005 Almost 9,000 square miles, measured in 2017 About 12,000 square miles in 1998

Correct Answer:

Almost 9,000 square miles, measured in 2017

Explanation:

The question tests your understanding of how large the Gulf of Mexico hypoxic zone has grown in the past. A hypoxic zone is an area where dissolved oxygen is so low that most marine life can’t survive, and its size changes each year depending on nutrient runoff, rainfall, river flow, and winds. In 2017, measurements showed the hypoxic zone covered about 8,800 to 9,000 square miles, which is the largest extent ever recorded in NOAA’s surveys. That makes the option describing almost 9,000 square miles in 2017 the best choice. Other years had smaller extents, so they don’t reach that peak.

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