Air Mass: An air mass may be defined as a large body of air whose physical properties, especially temperature and humidity are more or less uniform horizontally for hundreds of kilometres.
Fronts: A Front is that sloping boundary which separates two opposing air masses having contrasting characteristics in terms of air temperature, humidity, density, pressure and wind direction.
Warm Fronts : Warm front is that gently sloping frontal surface along which warm and light air becomes active and aggressive and rises rapidly over the cold and dense air.
Cold Fronts : In this front, cold and heavy air is active and uplifts the warm and light air.
Cyclones are centres of low pressure surrounded by closed isobars and having increasing pressure outwards. It has closed air circulation from outside towards the Central low pressure in such a way that air blow inward in anticlockwise in the Northern Hemisphere and clockwise in the S. Hemisphere. Cyclones range in shape circulars, elliptical to 'V shaped. Cyclone-immense influence on the climate and weather. Wherever they reach, they alter the temperature and precipitation conditions of the place. The origin of these cyclones is associated with the polar fronts, where two contrasting air masses converge.
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