Earth’s solid metal core may be soft on the outside: Study

 

Recent studies have provided new insights into the structure and dynamics of Earth's inner core, challenging previous assumptions about its solidity and uniformity.

Viscous Deformation of the Inner Core's Surface

A study from the University of Southern California suggests that the near surface of Earth's inner core may undergo viscous deformation, altering its shape over time. This deformation is likely caused by interactions between the turbulent molten outer core and the solid inner core. Such interactions indicate that the boundary between the inner and outer core is more dynamic than previously thought.

Softness of the Inner Core's Material

Research from the University of Texas at Austin reveals that the iron comprising Earth's inner core exhibits unexpected softness under extreme pressures and temperatures. The study found that deep within the Earth, solid iron becomes surprisingly soft because its atoms can move much more than previously imagined. This suggests that the inner core's material is less rigid and more malleable than once believed.

Implications for Earth's Magnetic Field

These findings have significant implications for our understanding of Earth's magnetic field. The movement and deformation of the inner core can influence the dynamics of the outer core, where the geodynamo generates Earth's magnetic field. A more deformable inner core could affect the flow patterns of the molten outer core, potentially impacting the behavior and stability of the magnetic field.

In summary, the inner core is not a static, rigid sphere but a dynamic region with a deformable surface and surprisingly soft material properties. These discoveries enhance our comprehension of Earth's interior and its magnetic field generation.

Website: popularscientist.com

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