Also called mist, fog is basically a "surface cloud" suspended over the Earth. Like
clouds, fog can form only where there are dust particles.
There are four general classes of fog: radiation, upslope,
precipitation, and advection.
They are formed when water vapour
in the air condenses as it cools below its dew point.
The different between mist and fog is the density of the "cloud". Fog is more dense,
resulting in poorer visibility than mist.
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