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GalFisk t1_ja6temu wrote

Reply to comment by Second-Officer-Alex in ELI5: Only the top layer of water freezes in a lake because this layer insulates the rest of the water but the water in a trough in a freezer freezes all the way through. Why? by gud_doggo

If you live in a place that gets cold enough in the winter, you can see this phenomenon on roads when it starts to get cold. The roadway on bridges will be frost-covered in the morning, because they have had cold air all around them, while roadways the ground is still clear.

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