Earth's surface temperature since birth?

[roj2003]

Given that the earth formed as a molten ball of silicate mantle and iron core(~1200 centrigrade?), what is the rate at which the temperature reduced to present day and is there a graphical image of this change against time?

 

[Shpaget]

 

[roj2003]

Sorry - not what I meant. Beginning with a molten core AND surface, at what time rate did the molten surface solidify and cool, down to present day, when we still have a molten core but a solid mantle?