Europa: How thick is the water ice layer? Liquid or solid?

Two suggestions for ridge formation: thick (warm) convecting ice; and thin ice with liquid water below.

http://photojournal.jpl.nasa.gov/

http://www.sigmaxi.org/amsci/articles/02articles/Greenberg.html

Another suggestion is a thick ice layer with no melt whatsoever -- the diapir model.

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