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zone between the lower mantle and the core are carried.
In 1964, the author proved this zone is about 160 krns thick and
velocity of elastic waves decrease in it gradually. Now he judges the
velocity of P wave, at the bottom of the transition zone, of 10 km/sec
The zone results layered, how the record of intervalled, successive
For the giustiflcation of this zone the Ramsey's theory is trought fit
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