Layered in horizons, it can aggregate into structures called peds.
An important measure of this material is its cation-exchange capacity and its color is notated using the Munsell system. WDPT is one measure of the water repellency of this substance. One important taxonomic scheme for it includes great groups and a lowest rank of series. Its Atterberg limits include liquid and plastic limits, which are related to its porosity. Its structure can be columnar, platy, or granular. Layered in horizons, it can aggregate into structures called peds. Examples of this substance formed from decomposing organic matter is called humus and its grains are classified by size into sand, silt, and clay. For 10 points, name this material in which plants can grow.
An important measure of this material is its cation-exchange capacity and its color is notated using the Munsell system.
soil