Scientists
Inge Lehmann
Seismologist
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A Danish seismologist who discovered the Earth's solid inner core in 1936 by noticing seismic waves that should have been shadowed by a liquid core were arriving anyway, deducing a denser, solid layer at the planet's very center. She lived to 104 and remained active in seismology into old age.
Facts
Defining ContributionDiscovered in 1936, from careful analysis of seismic wave travel times, that the Earth carries a solid inner core inside its molten outer core, reshaping the model of the planet's deep interior from a single liquid core to a layered one. 1 Cross-Tradition Connections
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