Loess soil is a windblown sediment comprised typically of dust and silt. Though wind is responsible for most loess soil, glaciers also contribute to the Earth's supply by grinding rocks into powder form, which is then transported by streams.
Loess soil is rich in minerals and appears in varying degrees of thickness, from 1 inch to 300 feet. This pale, crumbly soil is found in China, the North American Great Plains, Russia, Kazakhstan and the central portion of Europe. Because of its mineral content, its slowness to erode and its ability to drain well, it often becomes fertile soil that is ideal for agricultural use.