Marine Dead Zones Are Formed When Rivers That Empty into Oceans

question 55

Multiple Choice

Marine dead zones are formed when rivers that empty into oceans carry excess phosphorus and nitrate runoff. These dead zones are caused by

• A) precipitates of nitrate and phosphorus forming in the water.
• B) bacterial blooms.
• C) algal blooms.
• D) nitrate and phosphorus poisoning.
• E) increased acidity due to nitrates and phosphorus.

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