September 15th

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.

September 10th

Four different Biblical phrases refer to a specific feature of the internal structure of the Earth. They confirm our hypothesis that the interior of the Earth was tehom before Noah’s flood, and sheol after it.

September 9th

Cutaway of planet earth showing hell at the center

The popular science "liquid outer core" is speculative at best, and there is no reason why it can't be open space. The P-wave Shadow Zone is the great gulf of which Jesus spoke in Luke 16:26.