P3+-+Earth's+Inner+Core


 * Innermost hottest part of the [[image:350px-Earth-crust-cutaway-english.svg.png]].
 * Solid sphere, 760 miles in radius.
 * Consists of iron-nickel alloy.
 * Has a temperature similar to the Sun's surface.
 * The inner core is slowly cooling.
 * Naturally heats the upper layer.
 * Causes Earth's magnetism.