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  2. Soil classification - Wikipedia

    en.wikipedia.org/wiki/Soil_classification

    The most common engineering classification system for soils in North America is the Unified Soil Classification System (USCS). The USCS has three major classification groups: (1) coarse-grained soils (e.g. sands and gravels); (2) fine-grained soils (e.g. silts and clays); and (3) highly organic soils (referred to as "peat"). The USCS further ...

  3. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    USDA soil taxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series.

  4. Soil mechanics - Wikipedia

    en.wikipedia.org/wiki/Soil_mechanics

    These minerals tend to form in sheet or plate like structures, with length typically ranging between 10 −7 m and 4x10 −6 m and thickness typically ranging between 10 −9 m and 2x10 −6 m, and they have a relatively large specific surface area. The specific surface area (SSA) is defined as the ratio of the surface area of particles to the ...

  5. Soil formation - Wikipedia

    en.wikipedia.org/wiki/Soil_formation

    With time, soils will evolve features that depend on the interplay of the prior listed soil-forming factors. [9] It takes decades [ 116 ] to several thousand years for a soil to develop a profile, [ 117 ] although the notion of soil development has been criticized, soil being in a constant state-of-change under the influence of fluctuating soil ...

  6. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    A pH of 9.5 has 10 −9.5 moles hydronium ions per litre of solution (and also 10 −2.5 moles per litre OH −). A pH of 3.5 has one million times more hydronium ions per litre than a solution with pH of 9.5 (9.5 − 3.5 = 6 or 10 6) and is more acidic. [115] The effect of pH on a soil is to remove from the soil or to make available certain ions.

  7. Atterberg limits - Wikipedia

    en.wikipedia.org/wiki/Atterberg_limits

    Distinctions in soils are used in assessing soil which is to have a structure built on them. Soils when wet retain water, and some expand in volume ( smectite clay). The amount of expansion is related to the ability of the soil to take in water and its structural make-up (the type of minerals present: clay , silt , or sand ).

  8. The 4 Factors of Health: Understanding How we Can Live ... - AOL

    www.aol.com/news/4-factors-health-understanding...

    Photo by Emma Simpson on Unsplash The following post was written and/or published as a collaboration between Benzinga’s in-house sponsored content team and a financial partner of Benzinga. Much ...

  9. Catena (soil) - Wikipedia

    en.wikipedia.org/wiki/Catena_(soil)

    The term soil catena is used to describe the lateral variation in soils over a hillslope. [2] [3] The catena concept originated in central Uganda by chemist W.S. Martin [4] to describe a hill slope sequence at the Bukalasa research station. The term catena (Latin: chain) was first coined by scientist Geoffrey Milne to describe these soil ...