The fountains of the great deep are channels through the crust and mantle of the original Earth through which water drained into the great deep. They were later used to flood the Earth in the time of Noah.
The Earth Above the Waters
You can scratch your head all day pondering the spiritual truth behind a supposed metaphor, or you can take it literally and deduce that the Earth above the waters refers to the crust and mantle.
Deep Calls to Deep
We're going to ignore the possibility that Psalms 42:7 is flowery poetic language intended to teach us something spiritual. Instead we're going to use it as the description of a hydrological system in a test of Hypothesis 22.
The Great Deep
The deep and the great deep are both translated from the same Hebrew word, tehom. The difference signifies a transition from the deep where Earth was created to when the great deep is in the interior of the Earth.
Uniformitarianism exists to support the time scale needed in the popular science narrative of godless existence (SciPop) but it's not a testable hypothesis, so it's not scientific.
A classic example of the use of uniformitarianism is the calculation of how much has time has passed since the tectonic plates formed. Supposedly we can tell how fast the African and American continents are moving apart.
The Beams of His Chambers
"The beams of his chambers" isn't poetry. Well, yes it is poetry, but it's not poetry for poetry's sake. This describes the pillars of the
How Far Can a Kangaroo Swim?
For generations the evolution crowd has used the quirky Australasian fauna to belittle Creationists. How, the rhetoric goes, did the Monotremes and Marsupials manage to swim to Australia after Noah's flood?
Sheol refers to life beyond the grave, quite literally an underworld realm of the dead. It's also modified in a variety of ways which can be grouped to correspond to the main regions of the interior of the Earth.
Tehom was Wet. Sheol is Dry
The space in the interior of the Earth formerly occupied by the great deep is now a great gulf (chasm) of open space that Jesus spoke of in Luke 16:26. The open space is no longer referred to as tehom, it's now sheol.