Let's make the assumption that the flood covers
the land, everything goes underwater.
If one wants to go lalaland with "hydroplate theory"
and that the earth was all tropical lowland 4000
years ago, it's beyond any sane discussion.
So I will assume you are sane and understand numbers,
and continue.
The average thickness of antarctic ice is 2,160
meters. So let's just use that number.
Here comes the flood, and now the ice is overlooked
by water. Ice floats.
Put an ice cube in a glass. Add water. It floats.
Is glacial ice " stuck down" like ice in a sidewalk?
Let's say it is.
Density of water is 1g / cc at 4 degrees C
At -40 it's .96, at 100, it's also ,96
Ice is O.917 g / cc, though it becomes slightly denser
if it's very cold. 0.934g /cc at -180 C.
Let's have the water at 4 C. I g / cc and the ice
is 0.917 g/ cc.
In very round numbers, ice is 8% less dense than
water. Who could guess the salinity of the "flood"
so let's disregard the greater buoyancy of seawater.
What would be the buoyancy of 1000 kilos of ice?
Shouldn't it be able to hold 80 kilos?
Walrus climb up on ice flows without sinking them.
A square meter of ice 2000 meters tall is what,
2000 cubic meters. A cubic meter is 1000 kg
A cubic meter of ice is 917 kg.
The buoyancy- it's lifting power- is 83 kg per cubic meter. 2000 meter thick ice would have a buoyancy
of lets see...186,000 kg per square meter.
You see how IF water flooded over a glacier, it's gonna float?
For fun calculate how high out of the water 2000
meters of ice would float.