Seismologist inge lehmann studied earthquakes. She predicted inner core to be solid after observing the motion of p waves.
The seismometer, invented in 1880 captures and records the movement of seismic waves . By the end of this decade, there were seismic stations in all parts of the world. At that time, geophysicists believed that the Earth consisted of a liquid core enclosed by a solid mantle, which was surrounded by a crust, all separated by rapid changes in the Earth's density called discontinuities.
Lehmann theorized that the P-wave traveled some distance towards the core and then bounced off some sort of boundary. Her analysis of this data was the basis for her 1936 paper, which theorized that the center of the Earth was made up of two parts: solid inner core surrounded by a liquid outer core which was separated by what is known as the Lehman discontinuity.
Lehmann's hypothesis was confirmed in 1970 when a more sensitive seismometer detected waves bouncing off this solid core.
Know more about p waves here
https://brainly.com/question/18956633
#SPJ4
