I don't think the mass of the water would have a very noticeable effect on the perceived gravity. The average depth of the ocean is about 4 km, whereas the radi

I don't think the mass of the water would have a very noticeable effect on the perceived gravity. The average depth of the ocean is about 4 km, whereas the radius of the Earth is 6,000 km, and stone is denser than water as well.