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Answered 2012-04-25 02:34:27

Of these four choices, out current understanding of Europa (and remember, everything is subject to change in the light of more recent discoveries) indicates that Europa may have large liquid oceans under a layer of ice.

There are interesting surface features that appear to be large ridges; these might have been formed by cracks in the icy surface, and liquid or vapor escaping to the surface - and then freezing into ridges as the cracks close.

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