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quire for their discussion a whole book, like
that of Neison or the one by Nasmyth and
Carpenter. Here a few words must suffice.
Mountain ranges like our Andes or Himalayas
are rare. Instead of that, we see an immense
number of circular cavities, with rugged edges
and flat interior, often with a cone in the
centre, reminding one of instantaneous pho-
tographs of the splash of a drop of water
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