Exam 18: The Geography of Soils

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A thickness of a few centimetres of prime farmland soil may require how many years to form?

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Where is salinization likely to occur?

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Soil texture is probably the most permanent property of a soil.

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In terms of pedogenic regimes,which is the process that concentrates salts in soils in climates with high evapotranspiration?

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Warming temperatures have accelerated the thawing of Cryosols (Gelisols).Why is this of particular concern?

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Soils are the foundation of basic ecosystem function and are a critical resource for agriculture.

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A plant that is unable to extract needed water from soil has reached which of the following?

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Irrigation of arid lands can destroy the soil.

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Where is calcification likely to occur?

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Calcification processes accumulate excess calcium carbonates as illuviated deposits in the B horizon,and may cause caliche to develop.

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Soils will develop at faster rates in which of the following environments?

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Which are the great grassland soils of the world?

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The Canadian System of Soil Classification is a hierarchical system consisting of five categories.

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Prior to the Canadian System of Soil Classification and the U.S.Soil Taxonomy system,soils were classified based on pedogenic regimes.

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In a transect across the Chernozems of the southern Prairies,from west to east,which of the following gives the correct sequence?

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There is little evidence that human activity has an impact on soils.

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In the Northern Hemisphere,north facing slopes are generally colder,have slower snowmelt,and lower evapotranspiration rates and thus provide more moisture for plants than do south facing slopes.

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Between 1982 and 2007,there was actually a decrease in soil erosion on U.S.cropland.

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To which does "soil separates" refer?

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Soil is a natural,renewable resource.

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