As water cools, the molecules slow down so that eventually they do not have enough energy to break their hydrogen bonds.
As the temperature of pure water at atmospheric pressure reaches 0 °C, the water becomes locked into a crystalline lattice. Hydrogen bonds keep the molecules spaced apart, so ice is about 10% less dense than liquid water at 4 °C. Ice floats on liquid water.
If ice sank, ponds, lakes and eventually even oceans on Earth would freeze solid, making aquatic life as we know it impossible.
If this were the case, during summer, only the upper few inches of temperate oceans would thaw.
Instead, when a deep body of water cools, the floating ice insulates the liquid water below, preventing it from freezing.
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