Its structure can be classified as columnar, blocky, platy, or granular.
The WDPT measures the water repellency of this substance, whose color is measured by the Munsell system. Its structure can be classified as columnar, blocky, platy, or granular. This substance studied in the field of pedology occurs in O, A, B, C, and R horizons. A porous, carbonate-containing type deposited by wind or glaciers is called loess. This material may contain organic matter called humus, and its texture is classified by its proportion of sand, silt, and clay. Hydroponics is the practice of raising crops without this substance. For 10 points, name this earthen material in which plants grow.
The WDPT measures the water repellency of this substance, whose color is measured by the Munsell system.
{soil} [prompt on {dirt}]