How does a pond in Antarctica sitting at minus 50 degrees refuse to freeze, year after year, while everything around it is solid ice?

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The short answer is salt. The more interesting answer is that Don Juan Pond is barely a pond in the ordinary sense of the word. It sits in Antarctica’s Upper Wright Valley, one of the McMurdo Dry Valleys, where winter temperatures can fall to minus 50 degrees Celsius. Nearby lakes carry ice several metres thick. [...] The post How does a pond in Antarctica sitting at minus 50 degrees refuse to freeze, year after year, while everything around it is solid ice? appeared first on Space Daily .