a true intermediate substance were involved, the erosive action of wind
and water would necessarily produce any number of intermingling
intermediate forms in the range between rock and clay. However, there
are in fact only three forms that can be clearly distinguished from one
another: stones, sand, and clay. Furthermore, sand is sand wherever it
is; strangely enough, there is almost no difference in the size of the
grains whether they come from the Gobi Desert or from the beach at
Eno-shima. The size of the grains shows very little variation and follows
a Gaussian distribution curve with a true mean of 1/8 mm.
One commentary gave a very simple explanation of the decomposition
of land through the erosive action of wind and water: the lighter
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