Recent studies reveal that the inner core of Earth, a 1,500-mile-wide iron and nickel mass, exhibits changes that suggest it may not be completely solid. Researchers found that the outer boundary of the inner core has altered shape, likely due to the outer core's gravitational influence. The inner core's rotation has also been inconsistent, spinning faster in the past and currently slower than the surrounding layers. This new insight deepens the understanding of Earth's geological complexities, as direct observation remains impossible and relies on seismic wave analysis.
The inner core at Earth's center, composed of iron and nickel, may have changed shape recently, suggesting movement influenced by the outer core's tug.
Research shows the inner core doesn't spin in sync with the rest of Earth, leading to changes in its rotation speed over the decades.
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