Earth's core runs ahead of crust

US scientists claim to have confirmed that the Earth's core is spinning faster than its outer layers. The team compared seismic waves being produced by pairs of earthquakes occurring at the same location on the planet, but at different times. Waves from these nearly identical quakes passed through the Earth's core, they explain in Science magazine.

The results show that the inner core is rotating faster than the rest of the planet by about 0.009 seconds per year.

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http://news.bbc.co.uk/2/hi/science/nature/4184358.stm