Is the Rotation Real?

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Science  03 Jul 1998:
Vol. 281, Issue 5373, pp. 55-56
DOI: 10.1126/science.281.5373.55

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Earth's interior consists of a mantle, liquid core, and at the very center a solid inner core made of iron. One of the inner core's most peculiar properties is its anisotropy: Seismic waves travel slightly faster if they are parallel to Earth's rotation axis. In her Perspective, Souriau describes recent seismic studies that suggest the inner core rotates faster than Earth's mantle and comments on the current dilemma in interpreting the experimental findings.