Answer:
(i)
The Indian monsoon have wet and dry spells. The monsoon rains take place only
for a few days, at a time. They are interspersed with rainless intervals.
(ii) These breaks in monsoon are related to the movement of the monsoon trough.
(iii) The trough and its axis keeps on moving northward or
southward which determines the distribution of rainfall.
(iv) When the axis of the monsoon trough lies over the
plains, rainfall is good in these parts.
(v) On the other hand, whenever the axis shifts closer to
the Himalayas, there are longer dry spells in the plains and widespread rains
in the mountains catchment areas of the Himalayan rivers.
(vi) These heavy rains bring devastating floods that cause
damage to life and property in the plains.
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