Water and Ice

Unique property of water - Changing density with temperature

Have you seen a frozen lake? Is it frozen like your ice cube? Do fishes get frozen with the lake? That is not the way it happens. A water body in sub zero temperature may appear frozen, but actually it may be still liquid beneath an ice covering. Ice is less dense than water so it floats.

Protects aquatic life from freezing to death in sub zero climatic conditions. Water is Life, literally.
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Water & Physics