How To Make Wind and Influence Climate

[Hai-Etlik]

Or hmmmm..... core has more lead than iron (pick magnetically inert heavy-ish metal), atmosphere is denser than earth's, yadda, yadda. Or it outgases nitrogen and oxy at a rate that makes up for increased loss from somewhat lower grav..... there's AlWaYs rationalizations, even if they may not be proven rational, ifyaknowwhattImean.

Iron is the heaviest thing that there's enough of as it's the heaviest product of stellar nucleosynthesis. Heavier elements require more energetic and rarer processes to form, like supernovae and particle accelerators.