p2pnet.net OT News:- The Earth’s core rotates faster than the rest of the planet, says an “unambiguous” finding from a research team at University of Illinois at Urbana-Champaign.
It comprises a solid inner core about 2,400 kilometers (1,500 miles) in diameter and about the size of the moon, and a fluid outer core measuring about 7,000 kilometers (4,200 miles) across.
The inner core plays an important role in the geodynamo – the process that generates Earth’s magnetic field. Understanding how the inner core moves will allow scientists to better understand the geodynamo, says National Geographic News, quoting tomorrow’s Science
In 1996, University of Illinois geophysicist Xiaodong Song and Paul Richards of the Lamont-Doherty Earth Observatory in Palisades, New York, presented observation data for the super-rotation of the inner core.
The original finding was based on analysis of three decades of seismological records, says the National Geographic. Scientists have both confirmed and questioned the theory in the intervening years. Some scientists said the original finding could be a flaw in the data.”
University of Washington in Seattle seismologist Kenneth Creager, commenting in an accompanying opinion piece, says the research `removes any lingering doubt as to whether the inner core is rotating at a different rate than the mantle`.
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National Geographic News – Earth’s Core Spins Faster Than Surface, Study Confirms, August 25, 2005