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PHYSIOGRAPHY 



blow toward warmer regions, and so should be dry; but once 

 started, they are sometimes forced up over high mountains, and 

 precipitation follows. The heaviest rainfall on record, on the 

 southern slopes of the Himalayas, is due to monsoon winds. As in 

 the case of the planetary winds, it is the windward sides of the moun- 

 tains which receive the heavy precipitation from the monsoons. 

 It is clear, therefore, that the windward sides of high mountains are 

 places of heavy rainfall and snowfall. 



Land and sea (or lake) breezes (daily) rarely yield much rain, 

 though they may give rise to fogs when they blow from the warmer 

 water to the cooler land. Valley breezes sometimes give rise to 

 heavy showers. 



