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Revelations about the center of the Earth Recently, seismologists have observed that the speed and direction of seismic waves in Earth`s lower mantle, between 400 and 1,800 miles below the surface, vary tremendously. "I think we may have discovered why the seismic waves travel so inconsistently there,"stated Jung-Fu Lin. Lin was with the Carnegie Institution`s Geophysical Laboratory at the time of the study and lead author of the paper published in the July 21, issue of Nature.
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