sentence: Fog is made up of tiny water droplets or, in very cold conditions, ice crystals.
sentences_after: These water droplets make up the fog or mist. There are many types of fog, such as evaporation fog, advection fog, radiation fog, and upslope fog. The thickness of fog varies depending on the atmosphere, temperature, weather and location.
concept_name: fog
headings: Fog
categories: Weather