Hi

Why is Earth round? If it was a cube, flat on the surface we live in, it would be a point for us to see the USA, or any country in that matter, if we take our binoculars. 


It was probably created this way, so that we will not be able to see USA.

No matter where you are, I will catch you

No matter what angle you close at, I will hold you, because I am a rounded surface; you are a straight slab of door or stick. 


Round seems to have an edge over, be it to make wheels, which will succumb all surface of their friction, or ball bearings, which will grip any 2 components at any angle. One seems in the need to be more round, too.