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Generally these are made by aeroplanes. The local pressure differences caused by the plane's wings may cause air moisture to condense into fog (or cloud) as they pass through it. These streaks are known as vapour trails.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoWhen the air is full of particles larger that oxygen and nitrogen molecules, light of lower frequencies is also scattered, which adds to -the high- frequency scattered light to give us a whitish sky.
Wiki User
∙ 9y agoThe sky is sometimes whitish due to visible color and location. The sky is generally always blue, but if the sky absorbs all colors in a single location, it can appear white to the human eye.
Wiki User
∙ 14y agoOil and water vapor from jet engines.
Wiki User
∙ 14y agoplanes
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