300 Foxes and a Donkey's Jawbone
The heat of nuclear decay caused the core of the Earth to start melting, and it was partially dissipated by the waters of the deep which by circulated to the surface of the Earth transferring heat safely into the atmosphere.
Thus hath the Lord GOD shewed unto me: and, behold, the Lord GOD called to contend by fire, and it devoured the great deep, and did eat up a part. (Amos 7:4) KJV
"Ages in Chaos" is the name of a book by Immanuel Velikovsky, but the ages aren't in chaos. Earth is about 6,000 years old and it's presently stable. Mainstream science (SciPop) is in chaos, however, and it's never stable.
Earth in Upheaval is the name of a book by Immanuel Velikovsky which lays out his summary of the evidence for cataclysmic upheavals in the history of Earth. Like a lot of things, it's partly right and partly wrong.
The fire kindled in the lowest hell consumed the core of the Earth. The core melted completely so that the pillars of the Earth lost their base of support. The mantle collapsed.
The history of hell expanding is such a large and well developed doctrine in the Bible that it's fascinating that no one has developed it. At least until now.
There were two horses on Noah’s ark but now there are at least seven species in genus Equus. That's speciation or macro-evolution. It's not a problem because the process of evolution has a scriptural context.