Earth's inner core's strange behaviour could 'alter length of a day'

Earth's inner core is less solid, undergoes structural changes: Study

Outer Core Composition | Overview & Characteristics

'New hidden world' discovered in Earth's inner core

IMP. The Core 歌詞 -【歌詞リリ】

Inner Core of the Earth | Composition, Characteristics & Facts

Earth’s Inner Core Might Be Slowing Down and Changing Shape

Scientists discover Earth’s inner-inner core

Earth's inner core may have stopped turning and could go into reverse, study suggests