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[–] Tree_Snake 0 points 2 points (+2|-0) ago 

It's actually an oblate spheroid. Land and sea alike bulge out at the equator.

Are you asking why the sea isn't slung off by centrifugal force? Because that is overcome by the gravity of the Earth, which a tennis ball has very little of.

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[–] SaveTheChildren [S] 1 point -1 points (+0|-1) ago 

Water should drain away from the poles, and move toward the equator. We should have a water-buldge at the equator. The water level should be much much higher around the equator, so land should be underwater there.

Water should freely flow about the earth, it's not stuck to the earth like land is. Therefore, by centriugal force, water would be forced towoard the equator and bulge. The water level difference would be more extreme.

Do I have this right? I guess your argument is that the earth does buldge, but its the land and the water that both bulge together (I guess if the earth cooled while spinning we would kind of expect this). And water WONT freely move to the center of the spinning object due to the centrifugal force, because gravity.

I just think the earth is spinning much too fast, "gravity" as a solution to all sorts of problems just never sits right with me. Why does gravity seem so finicky? It's like, sometimes gravity is this really super strong force that does all sorts of things, and other-times gravity just isn't a big deal at all. Doesn't sit right with me.