Word: msterious
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Dates: during 1940-1949
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...Leet, assistant professor of Seismology, has measured velocities of 5.2 miles per second for "push" waves, a form imparting back and forward motion, which were travelling in the msterious upper mantle layer 21 miles below the surface of the earth. This is 1,440 miles per hour faster than any velocities yet recorded for this layer, and cannot be explained in terms of any familiar geological material or present theories about conditions of heat and pressure in the upper mantle layer...
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