Scientists Find Earth's Crust Has Repeatedly 'Rolled Over' Throughout History

Researchers have found evidence that the entire solid Earth has shifted or "rolled over" relative to its rotational axis multiple times throughout its history, a process that appears to be ongoing, according to Scientific American.

The findings come from an analysis of ancient sea-level changes, which scientists used to reconstruct how the planet's crust and mantle have moved relative to the poles over long geological timescales, a phenomenon known as true polar wander.

True polar wander differs from the more commonly discussed plate tectonics, as it involves the repositioning of the solid Earth as a whole relative to its spin axis, rather than the movement of individual tectonic plates relative to each other.

The research suggests that such large-scale shifts have happened repeatedly over Earth's history and continue to occur at a slow pace in the present day, offering new insight into the long-term dynamics of the planet's interior and surface.

Scientists say understanding true polar wander can help explain patterns in ancient climate and sea-level records that are otherwise difficult to account for using plate tectonics alone.

The study adds to a growing body of research examining how the deep structure of the Earth, including its mantle and core, influences large-scale geological and climatic processes over millions of years.