From Horrificus.
Just using logic, (smirking):
1. Godzilla fell into a vocanic fissure at the bottom of the ocean, travelled through the earths super heated crust, miles below the ground, and fought his way back up until he came out of a vocano.
Can anybody guess how much a continental plate weighs? How much pressure and heat is under there?
It is a lot more than a mountain. And, as I have said before, that Hulk/Mountain feat should be ignored. It makes no sense. He would have sunk right into the mountain, because rock and dirt cannot support it's own weight of 150 billion tons. The mountain would have had to have been on a giant adamantium dinner plate!
Anyway. At the same time, Godziall has also show that as his anger increases, he gets stronger.
His beams become more powerful.
He even has spontaneously evolved new powers.
He has resisted a black hole. His cells have even survived being in a black hole, and have regenerated, creating an entirely new Godzilla.
One blast from him vaporized a planetoid, leaving no debris.
He has grown back from his skeletal remains. Immortality?
So, come on. He is basically a 300 ft version of Hulk(stronger when angry)+Radioactive Man/X-Ray/Torch(radioactive, ability to blast)+Wendigo(supernatural monster)+Wolverine(healing ability), and whomever else you think of that has the ability to create a radioactive pulse/sheild capable of dismembering King Ghidorah, and mangling space titanium.