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- HelmutLv 71 decade agoFavorite Answer
Water reaches its maximum density at 3.98°C. As the water becomes colder it rises to the surface. When it freezes, it becomes even less dense, so that there will be water under the ice until the stream freezes solid.
- TGLv 71 decade ago
Because ice expands as it freezes, incoporating air, and becomes lighter than water.
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