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Unformatted text preview: which the transitions to higher forms take place, generally. Note that at around 800km and again at about 2000 km radius one expects discontinuities in the average density. This is true also of ice-rock mixtures at somewhat lower sizes. The phase diagram for water is complex because of the different types of ice: Water is "peculiar" in that ice I is less dense than the liquid - so down to -22 degrees C and 2115 bar pressure wdegrees C and 2115 bar pressure will induce melting. At 'larger' pressures ice behaves 'normally' and would not be melted at any depth. At very high pressure you can get ice formed even at >273 K....
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