Part of the Gulf of Mexico is called a "Dead Zone." Each year, excessive algal growth occurs due to an increase in chemicals such as nitrogen and phosphorus. When the algae decompose, oxygen in the water is depleted, leading to negative effects for marine life in the area.

Question

Part of the Gulf of Mexico is called a "Dead Zone." Each year, excessive algal growth occurs due to an increase in chemicals such as nitrogen and phosphorus. When the algae decompose, oxygen in the water is depleted, leading to negative effects for marine life in the area.

Question
What is the source of the nitrogen and phosphorus that create the "Dead Zone"?

Answer options with 4 options
A.
oil spills

B.
emissions from power plants

C.
excess fertilizers carried into rivers

D.
increased nutrient cycling due to invasive species