Because if they froze the sky would fall

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Oh and I'm sure your homeowners' insurance wouldn't cover that

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Clouds are made up of water vapor that condenses on small particles in the air called cloud (or ice) condensation nuclei (CCN). The individual water droplets are extremely small and you can't see them with the naked eye.<br />
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Pure water MELTS at 0 degrees C (32 F, 273.15 K) but it does not necessarily FREEZE at that temperature. Oftentimes, droplets become "super cooled" which just means they are below the aforementioned melting point in liquid form.<br />
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Here's the other clincher... most droplets are not pure water. They contain small amounts of other chemicals (so they are not just H2O). These chemicals make the droplets lower the melting point of the droplets, and therefore make it more difficult to freeze.<br />
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Lastly, the really high clouds (cirrus) are usually composed of ice crystals (as are other clouds at times). They don't fall though because ice is actually less dense than water so if the water droplets won't fall, there's no reason to suspect that the ice particles should either.

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thankyou!! my science teacher split a nail when i asked her that

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