When we consider the similarities between the third day and the Millennial Kingdom we should realize that, if flat Earth is Biblical, then maps of the supposed flat Earth should have Jerusalem at the center. They don't.
The Whole Earth
The Potter’s Hand
We have to deduce a physical process by which a solid ball of stratified sediment, the Earth at the end of the second day, is formed into a hollow sphere with a hydrological system by the end of the third day.
The Fountains of the Great Deep
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.
Formed: יֹצֵ֨ר – yatsar
Part of the meaning of the word translated as "formed" is pictured by how the potter's hand shapes a hollow vessel from a solid lump of clay.
March 6th
The preacher ponders rivers running into the sea. It may be rhetorical, a mystery of God. Or it's a hydrological cycle, and it's obvious and logical.