What is fog? And how does it happen?

<p style=";text-align:left;direction:ltr">Weather of Arabia - <a href="https://www.arabiaweather.com/content/%D9%85%D8%A7-%D9%87%D9%88-%D8%A7%D... is a natural phenomenon that occurs when the clouds are near or in contact with the surface of the earth, and the fog can be light or dense, and in all cases it leads to a decrease in the extent of horizontal visibility according to its density, and the fog may lead to a complete lack of horizontal visibility when it is very dense .</p><h2 style=";text-align:left;direction:ltr"> <strong>What are the types of fog?</strong></h2><ul style=";text-align:left;direction:ltr"><li style=";text-align:left;direction:ltr"> <a href="https://www.arabiaweather.com/content/%D8%A7%D9%86%D9%88%D8%A7%D8%B9-%D8... haze.</a></li><li style=";text-align:left;direction:ltr"> rising fog.</li><li style=";text-align:left;direction:ltr"> Freezing fog.</li><li style=";text-align:left;direction:ltr"> evaporation haze.</li><li style=";text-align:left;direction:ltr"> Valley mist.</li><li style=";text-align:left;direction:ltr"> Moving Fog.</li></ul><p style=";text-align:left;direction:ltr"></p><h2 style=";text-align:left;direction:ltr"> <strong>There is another classification of fog according to the places of its occurrence:</strong></h2><ul style=";text-align:left;direction:ltr"><li style=";text-align:left;direction:ltr"> <strong>Land fog</strong> : It is the fog that occurs over the land as a result of moisture in the atmosphere and the loss of heat from the earth&#39;s surface.</li><li style=";text-align:left;direction:ltr"> <strong>Valley fog</strong> : This type of fog occurs in valleys due to cold winds blowing from mountains to valleys.</li><li style=";text-align:left;direction:ltr"> <strong>Sea fog</strong> : Sea fog is formed as a result of the warm sea currents that blow to cold areas and may transport the fog to land over great distances.</li></ul><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> <strong>The video shows a simple explanation of how fog occurs</strong></p>