Surprising

The Earth's inner core, a solid ball of iron-nickel alloy, rotates slightly faster than the rest of the planet, completing an extra revolution approximately every 700 to 1,200 years.

Discoverer / Person
Xiaodong Song, Paul Richards
Year Discovered
1996 (discovery of differential rotation)
Field
Geophysics
Evidence Quality
Well-Documented

Why It Matters

This differential rotation generates shear at the inner core boundary, thought to be crucial for sustaining Earth's magnetic field through the geodynamo.

Source Consensus

1 sources agreed

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