ANS:C - wind

'Loess' is silty clay formed by the action of wind. Loess deposits are primarily composed of fine-grained materials, such as silt and clay, which have been carried by the wind over vast distances and deposited in layers. Over time, the accumulation of these wind-blown sediments forms thick deposits known as loess. These deposits are commonly found in regions where wind erosion and transportation of fine particles are prevalent, such as arid and semi-arid environments.