Notes Wind Erosion deflation – erosion caused by wind as it wears away sediments such as clay, silt, and sand. (wind picks up loose sediments and carries them away.) abrasion – erosion caused when windblown or water born sand grains strike other sand grains and rocks, and break off fragments and carry them away. (the force of striking breaks the rocks and carries them away.) loess – (deposition) thick deposit of very fine, wind-eroded sediments. (very tightly packed together.) dune – (deposition) the formation of hills because something has blocked the wind, forcing the sediments to “drop off.”