Question

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Why do lakes freeze from top towards bottom ?​

Answer 1

Colder than 4° Celsius (39° Fahrenheit), water begins expanding and becomes less dense as it gets colder. As a result, close to freezing, colder water floats to the top and the warmer water sinks to the bottom. ... Ice is less dense than water because of the way it forms a hexagonal crystalline structure.

Answer 2

Answer

⚫Here is the Reason For this

◾The upper surface of lake is in contact with the cold environment and starts to freeze.

◾The density of ice is less than that of liquid water.

◾Therefore, ice floats on the surface. Thus, the ice layer at lower temperature floats over the water below it.

◾Due to this the freezing of water into ice occurs continuously from top towards bottom.