LittleNipper wrote:Brad Hudson wrote:What you studiously avoid is that you have not shown, and cannot show, that the use of the sphere as an approximation is material to the calculation.
Not. Enough. Water. Period.
I'm perfectly fine with the answer: godddidt. But you're just tap dancing now.
More than 2/3rds to 3/4ths of the surface of this planet is covered in water. That does not include the amount of water that is located under the surface of the land masses. So, I would question your opinion that there is not enough water to cover all the land 20 feet deep --- given a very valid possibility that the land masses were smoother and the oceans shallower, and the water came from outerspace (comets and ice meteors) and underground springs.
Check the link I cited for the amount of water in, on, and above the earth. 96.5% of that is already in the ocean. There is not nearly enough. You have to just about double the water in, on, or above the earth to do it.
There is no evidence that, at any time within the last 6,000 years, the land masses were materially smoother, the oceans were materially shallower, or that any comet struck the earth. In fact, the evidence is so the contrary. It is not possible unless you invoke a supernatural, all powerful being, who can violate the known laws of physics and who went to significant effort to hide the evidence.