Inge Lehmann

Inge Lehmann ForMemRS (May 13, 1888 – February 21, 1993), was a Danish seismologist who, in 1936, argued that the Earth's core is not one single molten sphere, but that an inner core exists which has physical properties that are different from those of the outer core.

Read more about Inge Lehmann:  Life, Publications and Honors