Inge LehmannForMemRS(13 May 1888 – 21 February 1993) was a Danishseismologistandgeophysicist. In 1936, she discovered that theEarthhas a solidinner core[2][3]inside amoltenouter core. Before that, seismologists believed Earth’s core to be a single molten sphere, being unable, however, to explain careful measurements ofseismic wavesfrom earthquakes, which were inconsistent with this idea. Lehmann analysed the seismic wave measurements and concluded that Earth must have a solid inner core and a molten outer core to produce seismic waves that matched the measurements. Other seismologists tested and then accepted Lehmann’s explanation. Lehmann was also one of the longest-lived scientists, having lived for over 104 years.
