This is also inspired by a now-closed thread, "Plate tectonics, mountain building, and the Flood", over in "Geology and the Great Flood".
The Solar System has a lot of element sorting. The Sun and the gas-giant planets are mostly hydrogen and helium, the outer-solar-system objects are mostly icy, and the inner-solar-system objects are mostly rocky and iron-nickel.
However, this element sorting is produced by simple volatility and differences in temperature.
As it formed, the protosun heated its leftover solar nebula. But the inner parts got heated more than the outer parts, meaning that more materials boiled off of the inner than the outer Solar System.
Since carbon and oxygen are very cosmically abundant elements, outer planets could grow big enough from water and methane ices to keep hydrogen and helium from escaping from them, thus enabling them to be largely or mostly those elements.
And as Jupiter formed, it turned gravitational potential energy into enough heat to make it glow like a weak star; as a result, its Galilean satellites get more and more icy the farther out one goes. Io has no ice, Europa a thin layer of ice, and Ganymede and Callisto thick layers of ice.
It is very satisfying to recognize that a simple physical mechanism can easily account for all those features; I wonder if young-earthers have ever bothered to explain that.