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1906 Richard Dixon Oldham identified the separate arrival of P waves, S waves and surface waves on seismograms and found the first clear evidence that the Earth has a central core.

In 1909, Andrija Mohorovicic, one of the founders of modern seismology, discovered and defined the Mohorovicic discontinuity. Usually referred to as the "Moho discontinuity" or the "Moho,"

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