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One item necessary for a rain drop to form is called a
condensation nucleus. Pollutants in the air such as nitric acid and
sulfuric acid form nucleation sites (particles) where water vapor often
condenses and forms a droplet. As these droplets grow they collect more
moisture and may ultimately fall out as precipitation. This accounts for
some of the acid rain deposition on the planet's surface.
[Environmental
Science & Technology; v25; p2012-23; 1991.] [Environmental Science &
Technology; v19; p1044-8; 1985.]
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