Martian chaotic terrain, such as Gorgonum Chaos, is often found near to major outwash channels, suggesting it may be the result of water having run out from porous spaces underground and caused the ground above to become unstable. On Europa, vast regions of chaotic terrain occur where the surface ice layer has shattered into small blocks. These blocks appear to have rotated and tilted in a sea of soft liquid or slush, which then refroze and locked them in their new positions. Such activity is thought to be due to melt-through events, in which either localized tidal heating in the ice layer itself or an underlying volcanic heat source completely (though briefly) melted through the ice layer.
Related category GEOLOGY AND PLANETARY SCIENCE
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