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Fog

water cloud vapor near

Fog, cloud near the earth's surface. It is generally formed when the air has cooled so much that it cannot hold all its water vapor, and the excess is precipitated in the form of water droplets. Fog may also form from the addition of water vapor to already saturated air. Fog is most common near large inland bodies of water and along the coasts in temperate zones.

See also: Cloud.

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