Elon Musk
@elonmusk
We live on a thin crust of solid rock, beneath which is vast ball of molten rock.
Earth’s core, which generates most of our magnetic field is ~85% iron and moves independently from the surface plates, which is why the magnetic pole changes position.
https://x.com/elonmusk/status/1857960746635636813
https://x.com/BrianRoemmele/status/1857956034117288016