The centrifugal effect causes a bulge lol, look 'Centrifugal bulge' up.I guess you could say that, But I'm not really too sure about the whole "bulging" thing.
As something1 and I said, it probably has more to do with the centrifugal effect.
Yes please, no long responses. just some nice phy questions.
Edit: Actually 'Equatorial Bulge'.