Question: Do bubbles freeze in winter? 

Answer: Sure, just look at a frozen lake - you can usually see frozen bubbles in there.  The top layer of water almost always freezes first. Any air in the water (or released into the water) naturally rises and is trapped under the top frozen layer.  When the water under the top layer freezes, you have frozen bubbles.  Look in your ice cube tray - you might just find some frozen bubbles there!
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