10. Mist

It is also a type of fog but is relatively less dense. The only difference between mist and fog is density and its effect on visibility. A cloud that reduces visibility to less than 1 km is called fog, whereas it's called mist if visibility range is between 1 and 2 km. Mists are frequent over mountains as the rising warm air up the slopes meets a cold surface. Fogs are drier than mist and they are prevalent where warm currents of air come in contact with cold currents. Mist can occur as part of natural weather or volcanic activity or could be created artificially.