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The shrink–swell capacity of soils refers to the extent certain clay minerals will expand when wet and retract when dry. Soil with a high shrink–swell capacity is problematic and is known as shrink–swell soil, or expansive soil . [ 1 ]
Soil components larger than 2.0 mm (0.079 in) are classed as rock and gravel and are removed before determining the percentages of the remaining components and the textural class of the soil, but are included in the name. For example, a sandy loam soil with 20% gravel would be called gravelly sandy loam.
Soils with high shrink–swell capacity, such as vertisols, recover quickly from compaction where moisture conditions are variable (dry spells shrink the soil, causing it to crack). But clays such as kaolinite , which do not crack as they dry, cannot recover from compaction on their own unless they host ground-dwelling animals such as ...
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. [1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols.
Chapter 1 reports on background and basics. It includes tables of the diagnostics and of the RSGs. The latter is given below. Chapter 2 provides the rules for naming soils and creating map legends. It starts with the definition of some general terms in WRB, like ‘fine earth’ and ‘whole soil’.
A 72-year-old snowboarder in Idaho died after a tragic accident on the slopes two days before the new year. California native Charles "Charlie" G. Fletcher Jr. died on Monday, Dec. 30, as a result ...
Easterly winds are producing rough surf and strong rip currents, National Weather Service officials said. Beach hazard advisory for rough surf, rip currents issued for Volusia, Flagler Skip to ...
Map of the United States showing what percentage of the soil in a given area is classified as an Ultisol-type soil. The great majority of the land area classified in the highest category (75%-or-greater Ultisol) lies in the South and overlays with the Piedmont Plateau, which runs as a diagonal line through the South from southeast (in Alabama) to northwest (up into parts of Maryland).