Some analyses even proposed that the core didn’t rotate at all. One promising model proposed in 2023 described an inner core ...

Since the 1990s, models and seismic measurements have indicated that Earth’s iron-nickel inner core moves at its own pace. Over decades, the rotation of the inner core speeds up and slows down ...

This increased movement makes the inner core less rigid, weaker against shear forces.” Zhang and his fellow researchers used a miniature computer model of the Earth's inner core to predict the ...