Question

Why does the rainfall decrease from east to the westin northern india?

Answer 1

This is because the rain strikes the north eastern part first and then travels west
On the way travelling to west it gives heavy rain and loses its moisture so the rainfall decrease from east to west

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Answer 2

IN EAST OF INDIA THERE ARE SO MANY HILLS LIKE HIMALAYAS WHICH OBSTRUCT THE WAY OF CLOUDS IN THE EAST

AND IN WEST ARAVALIES LIES PARALLEL TO THE MONSOON WINDS AND THEREFORE ARAVALIES CANNOT OBSTRUCT THE WAY OF MONSOON WINDS

THEREFORE THE RAINFALL DECREASE FROM EAST TO WEST IN NORTHERN INDIA.