Fogs also can occur when cold air moves over a warm, wet surface and becomes saturated by the evaporation of moisture from the underlying surface. The most stable fogs occur when the surface is colder than the air above that is, in the presence of a temperature inversion. The mixing process is manifest when air that has been in contact with a wet ground or water surface having a different temperature from that of the air above is mixed with this air. The first process, adiabatic expansion, is responsible for the formation of clouds and plays a part in the formation of upslope fogs that are formed by the forced ascent of humid air up the sides of hills and mountains. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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