Sphericity scale
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The sphericity scale is a measure used by geologists and geographers which measures the sphericity of a stone or particle. A geographer can tell from a stone's sphericity if significant erosion has taken place in its location (such as a river). The more the stone resembles a sphere, the more erosion it has probably witnessed. This scale should not be confused with the scale which measures the shape of the stone and how angular it is.
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