Fog is a condensed collection of water droplets and ice crystals near the Earth’s surface.
Fog is differentiated from clouds through both its height – clouds being significantly higher in the atmosphere – and how moisture has been generated, with the former acquiring it from local, ground-based sources such as rivers, oceans and marshes. As a general rule, fog reduces visibility to less than one kilometres (0.6 miles), while mist or haze is anywhere over that distance.
Typically, fog accumulates in low-lying areas of terrain such as valleys and plains, due to the increased moisture content and shelter from strong winds.
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