Sparse clouds from the airplane window. Can be used for concepts of holiday, travel, distance and atmosphere. Low flight. In meteorology, a cloud is an aerosol comprising a visible mass of minute liquid droplets, frozen crystals, or particles suspended in the atmosphere above the surface of a planetary body. The droplets and crystals may be made of water or various chemicals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture (usually in the form of water vapor) from an adjacent source to raise the dew point to the ambient temperature. They are seen in the Earth’s homosphere (which includes the troposphere, stratosphere, and mesosphere). Cloud clouds fog foggy mist vapor vapour haze mist forest fly flying layer atmosphere aura village 3840×2160 UHD 4K.