the earth...even with all its mountains and seas is actually smoother than a billiard ball based on scale.
wow - who knew.
Earth has a tolerance of about one part in about 584, or 0.17%, from the reference spheroid, which is less than the 0.22% tolerance allowed in billiard balls.[61] The largest local deviations in the rocky surface of the Earth are Mount Everest (8848 m above local sea level) and the Mariana Trench (10,911 m below local sea level). Because of the equatorial bulge, the surface locations farthest from the center of the Earth are the summits of Mount Chimborazo in Ecuador and Huascarán in Peru..
http://en.wikipedia.org/wiki/Earth#Shape
Cheers,
Dean
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