Why hasn't the inside of the earth cooled;even though it is over 4 billion years old???

Answer 1

because it is well insulated

(and I don't believe it's that old - the true magnetic north is losing magnetism at an interesting rate

Answer 2

It has cooled, but reached an equilibrium point between heat lost an heat geneated by the decay of radioactive isotopes in the churning molten core. We could not have developed nuclear fission plants if radioactive remnants of supernovae weren't present in the core and periodically brought within our reach through plate tectonics and eruptions.

Answer 3

Its kept hot by heat released during the radioactive decay of the Potassium 40 isotope of which there is oodles in the Earth so the cumulative effect is lots of heat.

Answer 4

Two reasons. Firstly, there is a lot of dirt on top of the earth's core, and dirt is a fairly bad conductor of heat. Secondly, there is uranium and other radioactive materials in the core, which are decaying and producing heat.

Answer 5

It hasnt cooled down because the Earths core has so much pressure being put on it, it creates heat. So as long as there is pressure being put on the core, it will never cool down.

Answer 6

Earths core will eventually turn solid. cause when earth was first formed we was a big fireball something like the sun.and now were not.

Answer 7

Just a guess....
It's well insulated!
Under Mega TONS of Friction!
and the Devil likes it hot??

Ps. How do you know that it hasn't cooled some, since you don't know what the temp was at the start?

Answer 8

think of it like this whats holding you down on earth gravity and everytime you move you create friction well the core of the earth has the most gravity

Answer 9

http://en.wikipedia.org/wiki/Earth_core

Answer 10

Well I know that if it did, we couldn't be here.