This is the Ice phase diagram.
The Ice Phase Diagram
The diagram to the left can be used to predict how a satellite might evolve as the layers inside freeze and warm. The slanted blue line shows the changes in the temperature inside the satellite. Over the life of the satellite, the temperature inside will drop or increase. When that happens, the blue line in the diagram changes its slant.
The blue line is superimposed upon the Water Ice Phase Diagram. This diagram is the result of calculations of what phase of ice occurs at a certain temperature and pressure.
As the temperature falls, the blue line will also fall. When the blue line crosses a boundary into a new phase of ice, the ices will restructure themselves into the new phase, and the moon itself will shrink or grow. If it shrinks, the moon may perhaps form grooves, as on Ganymede. If it grows, the moon may crack, as on Europa.
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