If cooling occurred at the bottom of a pond instead of at the surface, would a lake freeze from the bottom up? explain
I would guess the top of the water is more exposed to the cold so it would freeze first and work its way down depending on how long its cold. A friend of mine has a koi pond. Every year the pond freezes, except the bottom where the fish lie dormant til the water thaws
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Ya! If you submerged freezing coils on the bottom of a lake it certainly would freeze from the bottom up. And depending on the air temperature at the surface, the surface may or may not freeze at all. It's the principal used in indoor ice rinks. But the surface temperature has to remain below 55 degrees to keep it frozen solid on the surface.
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As water approaches the freezing point, its density decreases. Therefore, ice will migrate to the top of a body of water.
CF2 posts a description of this process.
Annette describes an artificial situation, meaning one not found in nature.
Jay
Ya Jay and your point is? There is no way a body of water,without artificial intervention is going to freeze from the bottom up. The core of the earth is a furnace, like the sun. Unless the core freezes, the chances of anything freezing from the bottom up, without artificial means, is nonexistent.
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Hi, back to the Question ---If cooling occurred at the bottom of a pond --- Water freezes where temperature is below 0°C where ever it is, on the mars, on the moon, in the deep freezer or in a pond etc. Don't make it complicate: here in the swiss mountains ponds usually have in the springtime water above ice . (nice picture from Jay but, about ice: it is 1/11 lighter then water).
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