Orders
- Alfisols — moderately weathered, form under boreal or broadleaf forests, rich in iron and aluminum
- Andisols — form in volcanic ash and defined as containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite and ferrihydrite
- Aridisols — (from the Latin aridus, for “dry”) form in an arid or semiarid climate
- Entisols — do not show any "significant" soil profile development. Minimal soil horizons.
- Gelisols — soils of very cold climates which are defined as containing permafrost within two meters of the soil surface
- Histosols — consist primarily of organic materials
- Inceptisols — form quickly through alteration of parent material
- Mollisols — form in semiarid to semihumid areas, typically under a grassland cover
- Oxisols — best known for their occurrence in tropical rain forest
- Spodosols — typical soils of coniferous or boreal forests
- Ultisols — commonly known as red clay soils
- Vertisols — high content of expansive clay
Read more about this topic: USDA Soil Taxonomy
Famous quotes containing the word orders:
“He was thoughtful and grave—but the orders he gave
Were enough to bewilder a crew.
When he cried “Steer to starboard, but keep her head larboard!”
What on earth was the helmsman to do?”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“One cannot be a good historian of the outward, visible world without giving some thought to the hidden, private life of ordinary people; and on the other hand one cannot be a good historian of this inner life without taking into account outward events where these are relevant. They are two orders of fact which reflect each other, which are always linked and which sometimes provoke each other.”
—Victor Hugo (1802–1885)
“Selflessness is like waiting in a hospital
In a badly-fitting suit on a cold wet morning.
Selfishness is like listening to good jazz
With drinks for further orders and a huge fire.”
—Philip Larkin (1922–1986)