World Geography
The transport of warm air toward the poles and cold air toward the equator is due to

the longitude difference
the latitude difference
the development of waves
the temperature gradient

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World Geography
The rate of infiltration normally declines rapidly during the early part of rainstorm event and reaches a constant value after several hours of rainfall. The factors responsible for this phenomenon are I. the filling of fine soil pores with water, which reduces capillary forces II. moistened soil, clay particles to swell and reduce the size of pores III. raindrop impact breaking up with soil clumps, splashing fine particles into pores

I, II
All of these
II, III
I, III

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