[wastoute]

People like to say our earth’s temp. is duke to the Sun but I suspect it is molten iron and fusion at the core, more likelely.

[ProtectOurFreedom]

Re radioactive decay...lots of scientists agree...There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.

http://phys.org/news/2006-03-probing-earth-core.html

https://en.m.wikipedia.org/wiki/Earth%27s_internal_heat_budget

http://physicsworld.com/cws/article/news/2011/jul/19/radioactive-decay-accounts-for-half-of-earths-heat

[Tilted Irish Kilt]

Interesting reads :
Eighteen Hundred And Froze To Death (The Infamous 'Year Without Summer')
1816 :
www.freerepublic.com/focus/f-news/1361752/posts

How a Volcanic Eruption in 1815 Darkened the World
www.nytimes.com/2015/08/25/science/mount-tambora-volcano-eruption-1815.html?ref=todayspaper&_r=1

[huldah1776]

I think the temp of the earth would be comparable to having an internal heat source with a cooled control layer complete with sauna which is being kept at just the right temp by the heat lamp (sun) and heating vents from the internal source for those created in the image of the Creator. :)