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Which hydrogeologic process primarily dictates groundwater salinity stratification within endorheic basin lakes?

A)Capillary action of fringing vegetation
B)Evaporative concentration at the surface
C)Diffusion through aquitard layers
D)Osmotic pressure across sediment interfaces

💡 Explanation

When evaporation exceeds inflow in endorheic lakes, evaporative concentration at the surface increases salinity because water molecules preferentially vaporize, leaving dissolved salts behind near the top. Therefore evaporation yields salinity stratification, rather than other mechanisms that contribute less or create minimal stratification.

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