When lake starts freezing the formation of the ice will start first at which point? -Do You Know?

When lake starts freezing the formation of the ice will start first at which point? -Do You Know?
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Answer :

This process continues until all the water in the lake is at 4° C, when the density of water is at its maximum. With further cooling (and without mechanical mixing) a stable, lighter layer of water forms at the surface. As this layer cools to its freezing point, ice begins to form on the surface of the lake."
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