Result of condensation of excess water vapour when moist air is cooled below its dewpoint. Rain falls when droplets increase in size until they form drops whose weight is equivalent to the frictional air resistance. The greater proportion of raindrops have a diameter of 2 cm or less; in torrential rain a small proportion may reach 0-4 cm. Rain affects important geological work by assisting in the mechanical disintegration of rocks; also chemically, in bringing about solution of carbonates etc and, through the agency of running water, in redistributing the products of erosion and disintegration,
What is RAIN?
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