Question

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whats responsible for
eutrophication in seawater?
a) runoff of artificial fertilizers
b) deposition of sediments on
shorelines
c) groundwater infiltration
d) seafloor spreading

Explanation:

Eutrophication in seawater is mainly caused by excessive nutrients (like nitrogen, phosphorus) entering the water. Artificial fertilizers often contain these nutrients, and runoff from agricultural areas carrying them can lead to eutrophication. Sediment deposition (B) doesn't add nutrients, groundwater infiltration (C) usually doesn't introduce excess nutrients for eutrophication, and seafloor spreading (D) is a tectonic process unrelated to nutrient enrichment. So option A is correct.

Answer:

A) Runoff of artificial fertilizers