Final answer:
The strongest stratification or change in density with water depth occurs during winter at each location.
Step-by-step explanation:
The strongest stratification or change in density with water depth occurs during winter at each location.
In winter, a layer of ice forms on the water surface, as ice is less dense than water. Water is densest at 4°C and retains its liquid form below the water surface, where the ice layer is.
During summer, the stratification is weaker as the surface water temperature increases, causing the water to become less dense and preventing significant stratification.