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:
“There are nine orders of angels, to wit, angels, archangels, virtues, powers, principalities, dominations, thrones, cherubim, and seraphim.”
—Gregory the Great, Pope (c. 540–604)
“Let’s start with the three fundamental Rules of Robotics.... We have: one, a robot may not injure a human being, or, through inaction, allow a human being to come to harm. Two, a robot must obey the orders given it by human beings except where such orders would conflict with the First Law. And three, a robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.”
—Isaac Asimov (1920–1992)
“God is a foreman with certain definite views
Who orders life in shifts of work and leisure.”
—Seamus Heaney (b. 1939)