Generally the core of the ball is cork, rubber, or a mixture of the two.
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The center of mass of a sphere is its geometric center.
If it's wide flange, it's from center of web to web distance. Other structural members, it's center of flange to center of flange.
the center
you can find center of earth by using only the formulas
Center of mass of an equilateral triangle is located at its geometric center (centroid).