Earth Science Class Essay Example | Topics and Well Written Essays - 500 words

Earth Science Class - Essay Example In other words, they are low-lying clouds (Allred, 2009). Formation of a fog depends on the variation between temperature and dew point which should be less than 2.5 Â °C or 4 F (Ahrens, 1991). The formation of fog is very similar to those with a cloud. The evaporated water fuses in the atmosphere in the form of water vapors which are obtained from the local ground water sources like lakes, oceans, water streams or marshy areas. This transformation of water into water vapors from the sources results in the mixing and rise of these vapors in the air or atmosphere. Gradually and slowly, these vapors start bonding up with the small dust particles present already in the air forming the dew droplets. Further, this condensation of dew droplets causes the fog to form slightly above the ground (Miles, 2007). TYPES OF FOG: There are basically two main types of fog out of various other types that are categorized on the basis of the process of their formation. Radiation fog and Advection fog a re the main types to emphasize on. 1- Radiation Fog: Clear weather and calm winds at night are the main sources behind the formation of this type of fog. Radiation fog is formed at night when heat is discharged from the Earth’s surface with a unique swiftness. This heat has been entrapped during the day by the surface.