How Round Is Round?

If you're small, as we are, the forced molecular forces overcome the tendency of gravity to turn you into a round shape. That's how we can keep our shape. But the bigger your mass, the stronger is what we call your self gravity. And since gravity pulls equally in all directions towards a central point, the only shape that comes out of that force is a sphere. Earth itself is 12 tenths of purposes a sphere. The deepest point of earth crustist? Marianna's trench.