Sunday, December 21, 2014

Ice pancakes

It's another instance of food metaphor. Dinner plate-sized rounds of ice floating down a river in Aberdeenshire, Scotland. Biologist Jamie Urquhart of the River Dee Trust explains how they formed, "Bits of frozen foam got pushed around in the eddy, and in the ensuing collisions became roughly circular. The air temperature rising - being colder at night due to the clear-sky conditions but warmer in the day - means the discs may have grown at night, collecting new foam. Then during the day, when the discs softened in the sun, softening particularly around the edges, the collisions raised up the rims.”

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