Why does water expand when it freezes?

Why does ice float in the cool summer drink of your choice? And why don't ponds and lakes freeze from the bottom up, killing all the fish? Find out with the latest Naked...
01 April 2011
Presented by Sarah Castor-Perry

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Why does ice float in the cool summer drink of your choice? And why don't ponds and lakes freeze from the bottom up, killing all the fish? Find out with the latest Naked Science Scrapbook, where we'll see that it's all down to the weird and wonderful water molecules...

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