Patterns in ice

Have you ever noticed that the ice that forms in puddles doesn't always have a flat surface. If I manage to get to icy puddles before my children have jumped on the ice and broken it into small pieces I love to look at the patterns, and the trapped bubbles of air beneath the surface. This photo shows a piece of ice I managed to rescue from my children! Do you know how these patterns are formed? I'd be interested to learn!

Photo and post (and cold fingers) by Naomi at http://www.cotswoldfamilyholidays.com/

 

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