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Aeolian processes-involving erosion, transportation, and deposition of sediment by wind-occur in a variety of environments including coastal areas, semiarid and arid regions, and agricultural fields. Aeolian processes also occur on some planetary bodies, notably Mars and possibly Venus and on Saturn's moon Titan. Aeolian processes are responsible for the emission and/or mobilization of dust and the formation of areas of sand dunes. Fluctuations in the intensity and geographical extent of wind transport of sediments during the Quaternary have produced an important paleoclimatic record in loess deposits and areas of vegetationstabilized sand dunes.