Danish seismologist Inge Lehmann is born

Danish seismologist Inge Lehmann is born

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  • The Core of the Earth | 100 Greatest Discoveries

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  • Pestec: Inge Lehmann's 127th Birthday

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  • The Mystery of the Earth's Core Explained

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Lehmann discovered that the Earth has a solid inner core inside a molten outer core. Before that, seismologists believed Earth's core to be a single sphere. They were, however, unable to explain measurements of seismic waves from earthquakes, which were inconsistent with this idea. Lehmann’s theory solved the problem.

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