How does fog form?

Answer

Fog forms when the air near the ground cools fast. The cooling slowly spread upward. The coolest air is pulled down by gravity on the night with no wind.
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2 Additional Answers
Ask.com Answer for: How Does Fog Form
Fog forms when there is a lot of moisture near the ground, or when the air near the ground cools to the dew point.
Like clouds, fog is made up of condensed water droplets which is the result of the air being cooled to the point where it can no longer hold all of the water vapor it contains.
Fog is formed when the water from a cloud comes in contact with the ground. The ground must be a certain temperature for the fog to form.
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