Soils Classification Practice

Inceptisols are characterized by young soils that have some diagnostic features but lack "mature" horizons. They typically have weakly developed A horizons, which are usually ochric in color. This suggests that the soils are still in the early stages of development and have not yet fully developed the distinct horizons seen in other soil orders. Therefore, the correct answer is Inceptisols.

Spodosols are soils that form under coniferous forests or heath vegetation, where intensive acid leaching occurs. This leaching process leads to the accumulation of organic matter and aluminum (and sometimes iron) in the B horizon of the soil. Therefore, the given answer, Spodosols, is the most appropriate choice based on the information provided.

Vertisols are the correct answer because they are soil orders that contain 30% or more clay to a depth of 50 cm and exhibit shrinking and swelling properties. Vertisols are known for their high clay content, which causes them to expand when wet and shrink when dry. These soils are typically found in areas with distinct wet and dry seasons, where the clay minerals can undergo significant volume changes.

Gelisols are soils that form in cold environments where there is little development due to low temperatures. Frost churning is a typical characteristic of Gelisols, which refers to the process of freezing and thawing of the soil, causing mixing and movement of soil particles. This constant freezing and thawing leads to minimal soil development and a unique soil profile. Therefore, Gelisols are the most suitable answer based on the given information.

Mollisols are the correct answer because they are characterized by the accumulation of calcium-rich organic matter, which leads to the formation of a thick and dark A-horizon. Mollisols also have a high base exchange capacity, which means they can retain and supply nutrients to plants. The cool, sub-arid to sub-humid plains of prairies mentioned in the question are a typical environment where Mollisols are found.

Histosols are soils that have a thick organic layer, typically more than 40 cm thick, and are characterized by the presence of organic soil materials extending down to an impermeable layer. These soils are usually found in wetland areas where organic matter accumulates due to waterlogged conditions, leading to the formation of peat or muck. Histosols have a high water-holding capacity and are often used for agriculture or as wetland habitats.

Histosols are the correct answer because they are characterized by the accumulation of organic matter in thick layers. They form in wetland areas with anaerobic conditions, which inhibits profile development. These soils are typically found in areas without permafrost and are rich in organic materials.

Entisols are soils that have little or no horizon development, meaning they do not have distinct layers or horizons like other soil types. They are often found in varied locations, including areas with youth (recently formed), erosion, or aridity. These soils are characterized by their lack of profile development, making them different from other soil types such as Inceptisols, Aridisols, and Alfisols.

Alfisols are the correct answer because they are described as being more weathered than mollisols (grassland soils) but less weathered than spodosols (forest soils). They are typically found in deciduous forests or savannas. This description matches the given information, making Alfisols the most suitable option.

The given correct answer is "yes" because the question asks if the information provided was helpful in testing one's knowledge, and the respondent agrees that it was.

Washed out grey, pale colors. May include pale blue and green and rust colors

humid tropics and subtropics (old soils)

The statement is true because Gleysolic Order is a soil order that is specifically recognized and classified by the Canadian System of Soil Classification. This order refers to soils that have a high level of soil moisture and poor drainage, which is common in many parts of Canada. It is not recognized or classified in other soil classification systems used in different countries, making it exclusive to Canada.

Umbric surface horizon has a low base saturation according to USDA. The term "base saturation" refers to the percentage of exchangeable bases in the soil, such as calcium, magnesium, and potassium. A low base saturation indicates that the soil has a lower concentration of these exchangeable bases. Umbric soil is typically found in areas with high rainfall and leaching, which can result in the removal of these bases from the soil. Therefore, Umbric surface horizon is the correct answer for a surface horizon with low base saturation.

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Oxisols, Ultisols, Andisols have no CSSC equivalents

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Aridisols are the correct answer because they are soils that form in arid or semi-arid environments where there is limited water availability. These soils typically have a light colored (ochric) A horizon, which is the uppermost layer of soil. Aridisols are found in regions such as deserts and dry grasslands, where there is low rainfall and high evaporation rates. The light color of the A horizon is a result of mineral leaching due to the lack of water.

The correct answer is the order, suborder, great group, subgroup, family, and series. This is the hierarchical classification system used by the USDA. The order is the highest level of classification, followed by suborder, great group, subgroup, family, and series. This system allows for the organization and categorization of different species and groups of organisms based on their similarities and differences.

Ultisols have a higher degree of soil development than Alfisols but lower than Spodosols

The correct answer is Spodosols for the order and Orthos for the sub-order. Spodosols are a type of soil order characterized by the accumulation of organic matter and aluminum and iron oxides in the subsoil. Orthos is the correct sub-order within the Spodosols order.