As water ice floats, it helps life on earth survive. In winter, the surface temperature is very low, and when the water freezes, the floating ice forms an insulating layer in the lake or sea. This layer of ice insulates the water beneath, keeps it liquid, and allows life to survive in it. Since water ice floats, it helps life survive on Earth. In the winter, when surface temperatures are low enough for water to freeze, floating ice forms a layer of insulation on top of lakes and seas. This ice layer insulates the water below it, allowing it to stay liquid, which allows the life within it to survive.
Near the freezing point, liquid water molecules begin to be placed in a hexagonal structure that fills the space. In winter, cold water becomes less dense and floats to the top as the temperature of the lake approaches below freezing.
If the ice doesn't float, it will. Water continues to radiate heat from its surface and becomes colder and colder until the water and everything in it harden from bottom to top.
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