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Why do lakes freeze from top towards bot...

Why do lakes freeze from top towards bottom ?

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The upper surface of lakes is in contact with cold enviroment 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 ot this the freezing of water into ice occurs continuously from top towards bottom.
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SUBHASH PUBLICATION-HYDROGEN-Two marks questions and answers
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  7. Why do lakes freeze from top towards bottom ?

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  12. What are the uses of Heavy Water ?

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