Erosion can often remove the "top" type of this substance.
The SSURGO database contains digital maps of this substance. Alternating periods of formation and removal of this substance is the subject of the theory of bio-rhexi-stasy. The equation of state for the formation of this substance can be remembered by using the mnemonic "CLORPT", and that equation was derived by Hans Jenny. The Willamette valley contains a unique igneous-derived type of it called Jory. Illuvium is material displaced from one layer of this substance to another, which can create cutans. The layers of this substance can be subdivided by color and (*) texture into O-A-B-C-R horizons. The cation-exchange capacity of this substance, which is derived from so-called "parent materials", can be increased by increasing the amount of humus. Erosion can often remove the "top" type of this substance. For 10 points, name this substance which is created in the process of pedogenesis, a mixture of organic matter and minerals that supports plant life.
The SSURGO database contains digital maps of this substance.
soil