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$\begingroup$ Mercury (4880 km diameter) is slightly larger than Moon (3476 km), has a larger iron core than Moon and yet it is geologically dead. $\endgroup$
– L.Dutch ♦
Commented Apr 8, 2023 at 3:48
$\begingroup$ The issue here isn't geological activity but ability to support an oxygen atmosphere. Mercury's core has cooled; which was the purpose of introducing radioactivity to keep the core warm. $\endgroup$
– Rocky Rococo
Commented Apr 8, 2023 at 23:22

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