In meteorology, a
cloud is a
visible mass of liquid droplets or frozen crystals made of water or various chemicals
suspended in the atmosphere above the surface of a planetary body.
These suspended particles are also known as aerosols and
are studied in the cloud physics branch of meteorology. Cloudiness reaches
minima near the poles and in the subtropics close to the 20th parallels, north
and south. The latter are sometimes referred to as the horse latitudes. The
presence of a large-scale high-pressure subtropical ridge on each side.
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