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Fog — For other uses, see Fog (disambiguation). Part of the Nature series on Weather Calendar seasons Spring … Wikipedia
Variometer — The term Variometer also refers to a type of tunable electrical transformer A variometer (also known as a rate of climb indicator, a vertical speed indicator (VSI), or a vertical velocity indicator (VVI)) is an instrument in an aircraft used to… … Wikipedia
Sunlight — This article is about light emitted by the Sun. For other uses, see Sunlight (disambiguation). Sunshine redirects here. For other uses, see Sunshine (disambiguation). For natural lighting of interior spaces by admitting sunlight, see Daylighting … Wikipedia
The Dalles, Oregon — The Dalles and the Columbia River as seen from Kelly Viewpoint … Wikipedia
Speed to fly — is a principle used by soaring pilots when flying between sources of lift, usually thermals, ridge lift and wave. The aim is to maximize the average cross country speed by optimizing the airspeed in both rising and sinking air. The optimal… … Wikipedia
Drought in the United States — A farmer and his two sons during a dust storm in Cimarron County, Oklahoma, 1936. Photo: Arthur Rothstein. Drought in the United States is similar to that of other portions of the globe. Below normal precipitation leads to drought, which is… … Wikipedia

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