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

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

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World Geography
The temperature inversion is

whenever the normal decrease of atmospheric temperature or moisture or both change with height over
All of these
whenever the normal decrease of atmospheric temperature
when the decrease in temperature or moisture or both takes place

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