The bible also says that the earth has foundations, four corners, pillers and having a cornerstone. There are more verses that state those as descriptions than the one saying that the earth hangs on nothing. The verse that speaks of the earth being a circle follows that statement by desbribing the heavens as a curtain that are stretched out like a tent.
It's definitely hard to start asking difficult questions and it's nice to see you doing that, Chris. :)