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The loess, Loess, is generally pressed and dense earthy horns, which are composed of silt-sized particles of fine sand and clay that are carried by the wind and deposited. It is loosely transformed by potassium carbonate and is usually homogeneous, unfamiliar, and has a high porosity. It is widely distributed in northern China, Central Europe, North America, and North Africa, accounting for about 10% of the total surface area. In Korea, about 35% of the soil is composed of loess, which is much higher than the world average, of which about 15% is loess and 20% is loess. Yellow loess is a fine-grained deposit of ash-colored quartz or feldspar, which is very suited to agricultural life because the soil is fertile and tender by gathering the calcareous matter in the rainwater. Civilization was established on the basis of the development of agricultural productivity in this loamy region.