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Geography

Which mechanism causes stratification and decreased mixing in deep freshwater lakes experiencing prolonged heat waves?

A)Density differences due to temperature gradients
B)Increased wind shear at the water surface
C)Reduced nutrient input from decreased rainfall
D)Altered salinity gradients from evaporation

💡 Explanation

When heat waves occur, surface water warms, creating a strong thermocline because warm water is less dense than cooler water, inhibiting vertical mixing. Therefore density differences cause stratification, rather than wind shear, nutrient input, or salinity which have opposing or minimal effects in this scenario.

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