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:
“I’ve got orders to obey, thank God.”
—Robert Bolt (1924–1995)
“The newspapers, especially those in the East, are amazingly superficial and ... a large number of news gatherers are either cynics at heart or are following the orders and the policies of the owners of their papers.”
—Franklin D. Roosevelt (1882–1945)
“What is all wisdom save a collection of platitudes? Take fifty of our current proverbial sayings—they are so trite, so threadbare, that we can hardly bring our lips to utter them. None the less they embody the concentrated experience of the race and the man who orders his life according to their teaching cannot go far wrong.”
—Norman Douglas (1868–1952)
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