Earths Inner Core
The Inner Core of the Earth, the Earths inner most, hottest part as detected by seismological studies, is a primarily solid ball about 1,220km in radius or about 70% that of the moon. It is believed to be made of an Iron-nickel alloy. The Inner core could have a temperature similar to the suns surface, about 5,505 Celsius. The existence of the inner core from the liquid outer core was discovered in 1936 by seismologist Inge Lehmann using observations of earthquake generated seismic waves that partly reflect from its boundary, and can be detected by sensitive seismographs on Earths surface. It is made of...
-solid Iron
-Nickel
-solid Iron
-Nickel
in this video it talks about the Inner core from 1:27-1:50