Seismic waves suggest the planet's solid inner core is being pulled out of shape – and it has undergone these changes over ...

Seismic data supports this theory, showing unusual wave movements benea... Research suggests Earth’s inner core, a metal sphere within the molten outer core, is slowing its spin and reshaping.

Two huge masses deep within Earth may have remained stable for billions of years, surviving the powerful churn of the interior, according to an analysis of seismic waves ringing throughout the planet.