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The addition of air particles to hydrated drops (snow, rain, sleet, etc.) by coagulation as the drops fall through the sky.

[Air Pollutants and Their Effects on the Terrestrial Ecosystem; v18 - Advances in Environmental Science and Technology Series; Hidy, ed.; pages 239, 240, 243; 1986; Wiley; New York.] [Journal of Geology; v102n3; pages 283-296; 1994.]

Source: Atmospheric Chemistry Glossary

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