document.write(""); (pores/capillary canals, network, etc.). Use of this Web site constitutes acceptance of the Soil is the material found on the surface of the earth that is composed of organic and inorganic material. Soil Structure Sand, silt, clay, and organic matter particles in a soil combine with one another to form larger particles of various shapes and sizes and are often referred to as aggregates, or clus-ters. Single particles when assembled appear as larger particles. The presence of colloids is moderate and coarse particles are arranged in small clods or aggregates. There Soil structure is one of the defining characteristics of a soil horizon. Soil structure affects water and air movement in a soil, nutrient availability for … Soil structure is the arrangement of soil particles into groupings. document.write("