Is the inner core a solid or a liquid? – Extreme Temperature Zone

Question: Is the inner core a solid or a liquid?
- Keywords:
  earth,
  heat,
  state
Asked by Noodlemeister to Joe, Jos, Kate, Lisa, Pierre on 13 Nov 2014.
- Joe Reed answered on 13 Nov 2014:
  
  The inner core is extremely hot, but due to the extremely high pressure it is under it is a solid lump of iron and nickel. There is then a liquid outer core around it.
- Kate Dobson answered on 13 Nov 2014:
  
  The inner core is about 1220km in diameter, is made of Iron and Nikle and is generally considered to be a solid, although some experimental reserachers now think it is a plasma that is under such pressure it has the properties of a solid. It’s hard to be certian becasue we can only work out it’s properties from the surface! The outer core that surrounds has a very similar composition, is liquid. Convection in this region it the reason we have a magnetic field. So the core protects us all from solar radiation
- Lisa Simmons answered on 19 Nov 2014:
  
  I’m going to leave this at Kate’s answer, it’s her field of expertise

Question: Is the inner core a solid or a liquid?