Definition: Small particles in the air become surfaces on which water vapor can condense and forms cloud droplets. Sources of cloud condensation nuclei can be both natural and human-caused. Natural sources of cloud condensation nuclei include volcanic dust, sea spray salt, and bacteria. Humans also release unnatural chemicals into the air from the burning of fossil fuels and from industrial sources. One example is photochemical smog.
Cloud Condensation Nuclei
By Rachelle Oblack, About.com Guide
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