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| 0119 |
The Pulse of Asia : vol.1 |
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lar phenomena. For instance, Church, speaking of the
Akjas River in the eastern Tian Shan plateau, says in a
matter-of-fact way:—
"I don't know how they cross it when the snow is melt-
ing in spring, but suppose that then the old plan of wait-
ing for a few cloudy days has to be adopted."
The significance of all this for our present purpose lies
in the fact that increased cloudiness, however caused, pre-
serves ice and snow. It also prevents evaporation. If Asia,
for instance, should, as a whole, become more cloudy, the
result would be a series of phenomena practically identi-
cal with those which characterize fluvial epochs; and also
practically identical with those which would ensue if the
temperature of the country were lowered, or if the amount
of rain and snow became larger. The size of glaciers would
increase; the volume of springs and rivers would be larger
and more uniform; lakes which have no outlet would ex-
pand; the soil would everywhere be moister; and vegetation
would flourish in places which are now desert. We do not
yet know whether fluvial epochs are due to greater cloudi-
ness, heavier precipitation, or lower temperature — probably
to all three. The question is of especial interest because of
the diverse influence which changes of the three kinds
would probably have upon the occupations and hence upon
the history of man. We shall come to it again in another
connection.
The main features of the bottom of the Shyok valley, in
addition to the rough flood-plain, are terraces of gravel and
talus, covered with fans whose fronts have been nipped
off by the river. Behind them tower splendid cliffs, one or
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