why is it that the inner core is the hottest part on earth yet the deepest part? its the part furthest away from the

Question: why is it that the inner core is the hottest part on earth yet the deepest part? its the part furthest away from the sun so why is it so hot?!
- Keywords:
  core,
  deepest,
  earth,
  furthest,
  hot,
  hottest,
  part
Asked by charlie13 to David, Luna, Probash on 25 Mar 2011 in Categories: General.
- David Pyle answered on 25 Mar 2011:
  
  It’s hot from the beginning of time – it got hot as it formed because of radioactive heating, and heating by conversion of gravitational potential energy. It is now cooling, but only slowly.

Question: why is it that the inner core is the hottest part on earth yet the deepest part? its the part furthest away from the sun so why is it so hot?!