Dead zones occur due to a lack of ________ in the oceans.
A)sediments
B)phosphorus
C)oxygen
D)nitrogen

Question

Quizplus · Accepted Answer

Dead zones occur due to a lack of oxygen in the oceans, which is caused by excessive nutrient pollution from human activities such as agriculture and wastewater treatment. This leads to overgrowth of algae and other microorganisms, which consume the oxygen in the water and create areas where marine life cannot survive. Sediments and nitrogen may contribute to dead zones, but the primary cause is a lack of oxygen. Phosphorus is also a nutrient that can contribute to dead zones, but it is not the only nutrient involved and is not the primary cause.

Dead Zones Occur Due to a Lack of ________ in the Oceans