CIRCLE WITH A DOT

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Happy birthday to Danish #seismologist Inge Lehmann (1888 – 1993) who demonstrated that the Earth’s core is not a single molten sphere, but contained an inner solid core, in ‘36.
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She later also discovered the Lehmann discontinuity in the mantle. When she received the Bowie medal in ‘71 (1st woman to receive the highest honour of the AGU), her citation noted that the “Lehmann discontinuity was discovered through exacting scrutiny of seismic records by a master of a black art for which no amount of computerization is likely to be a complete substitute...”.⁠ 🧵5/5

CIRCLE WITH A DOT

Happy birthday to Danish #seismologist Inge Lehmann (1888 – 1993) who demonstrated that the Earth’s core is not a single molten sphere, but contained an inner solid core, in ‘36.