So that they roll smoothly. Notice that the balls for American football are not spheres, they bounce unpredictably when they hit theground.
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balls
Basketballs, Baseballs, Golf balls, some bouncy balls, a Globe, and things that carry that same shape. :)
Most balls are sperical. Starts and planets are roughly sperical, as are oranges.
A sphere is a 3D shape. Here are some sphere facts: * A sphere has one face which wraps around the whole of it's shape. * A sphere is the 3D equivalent of a circle. * A sphere has no vertices or edges. CK x
No an egg is not a sphere. It is an ovoid. This shape is named after the shape of an egg.