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Which process causes temporary meromictic conditions in a lake following a extreme rainfall event?

A)Density stratification by salinity changes
B)Nutrient upwelling from anoxia creation
C)Thermal convection from surface cooling
D)Epilimnion deepening via complete mixing

💡 Explanation

When there's extreme rainfall, freshwater influx creates density stratification because less dense freshwater stays at the surface, preventing mixing. Therefore, salinity-driven stratification leads to meromictic conditions, rather than upwelling, thermal convection, or complete mixing, which require density equilibrium.

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