Weathering

Horizons of soil
There are various varieties of soil, and each has a unique set of qualities. Any soil that has been thoroughly dug up will reveal layers, or horizons (O, A, E, B, C, R). A soil profile is created when the horizons are combined. Each profile describes a soil’s life as a biography. The three main layers of most soils are A, B, and C, while some soils also include an organic horizon (O).
Horizons are the individual layers that makeup soil. Depending on their location and makeup, these strata are referred to as O, A, E, B, C, and R.