What oceanographic mechanism explains the exceptional clarity and oligotrophic nature of the Aegean Sea?
Answer and explanation
Correct answer: A. Severe nutrient limitation and low terrestrial river runoff
- Step 1: The Aegean Sea is classified as ultra-oligotrophic, meaning it has extremely low concentrations of dissolved nitrogen and phosphorus. Because few major rivers discharge into the basin, phytoplankton concentrations remain very low, allowing sunlight to penetrate deeply and creating crystal-clear water. Answer: Severe nutrient limitation and low terrestrial river runoff. Why not the others: "Excessive industrial chemical bleaching" is an absurd environmental claim with no relation to natural marine optical properties; "Deep freezing of subsurface currents" falsely posits arctic thermal conditions in the warm temperate Mediterranean basin; "Total absence of any marine life" is factually untrue; the Aegean supports rich biodiversity, albeit in low biomass densities.
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