Seems about right to me as well.
My “Are you sure?” question was sarcastic/rhetorical, and was directed toward the FReeper who said the small sphere was “obviously” not correct.
Sorry All, I stand corrected.
Doing doing some *rough* comparisons, the water sphere is ~800 times smaller than the planet Earth. Given that volume of water the depth would be about 3000 meters around the entire globe.
So much for my optical conclusion.
I guess I’m due for cal...