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The USDA Soil Orders

For each description, type the USDA Soil Order that corresponds to that order

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Last updated: June 22, 2025

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First submitted	October 5, 2021
Times taken	133
Average score	58.3%
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Description	Soil Order
Clay-rich soil characterized by the presense of large amounts of swelling clays	Vertisol
Dryland soil with little organic matter and little leaching of nutrients, lots of salts	Aridisol
Soil of recent orgin. Soil horizon formation limited to thin A horizon.	Entisol
Soil containing permafrost close to the surface	Gelisol
Soil formed from volcanic ash	Andisol
Ancient soil defined by heavy weathering, oxidation of iron in sediment	Oxisol

Description	Soil Order
Soil dominated by buildup of organic matter	Histisol
Soil of recent orgin. Soil formation limited to A and a B horizon	Inceptisol
Soil dominated by thick and dark A horizon, relative lack of leaching of nutrients, grassland environments	Mollisol
Leached soil poor in nutrients and highly acidic most present in coniferous forests	Spodosol
Old soil with heavy weathering, heavy accumulation of clays below the surface. Frequent reddish color due to oxidation	Ultisol
Soil with accumulation of clays below the surface and somewhat leached, though not to the extent of older soils elsewhere	Alfisol

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2 Comments

Level 39

Jun 16, 2025

I think the permafrost soil might have a misspelling! I tried several spellings and none worked.

Level 68

Jun 22, 2025

Fixed

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