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...h by sea and air travel and by [[parvum in multo|pim]] tunnels beneath the surface. ...eter]], there are several hundred thousand islands scattered across Sent's surface. Not all of them, however, are surrounded by water. Most of Sent is indee

..., in [[geometry]], the word "sphere" only applies to the two-dimensional [[surface]] as described above, not to its three-dimensional [[interior]]. The inter ...<math>\frac{4}{3} \pi r^3</math>. The sphere has a smaller [[ratio]] of [[surface area]] to [[volume]] than any other [[Euclidean geometry|Euclidean]] [[soli