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fog
In essence, a cloud touching or near to the Earth's surface. A fog is a suspension of tiny water (sometimes ice) particles in the air. Fogs are a result of the air's humidity being high enough that condensation occurs around suitable nuclei; and are found most often near coasts and large inland bodies of water. In industrial areas, fog and smoke may mix to give smog. Persistent advection fogs occur when warm, moist air moves over cold land or water.
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