Q: How much water is needed to produce the Biblical Flood?
A: 4.5e18 m3.
The Flood covers the mountains by 15 cubits, says Genesis 7:19-20. We
assume that the volume of the land is small compared with the volume to
be filled (because most of it isn't mountains) so the water is
just a spherical shell. The radius of the earth is 6.4e6 m, Everest is
8848m high, and 15 cubits is 6.9m. Hence the amount of water required
4.5e18 m3 = 4.5e21 kg = 1.5e47 molecules.
The amount of energy required to create this much water (via E = mc2) is 5e38 J.
This much energy would power the sun for 1.3e12 s = 4e4 years.
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