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  2. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    There are 12 soil orders (the top hierarchical level) in soil taxonomy. [2] [3] The names of the orders end with the suffix -sol. The criteria for the different soil orders include properties that reflect major differences in the genesis of soils. [4] The orders are: Alfisol – soils with aluminium and iron.

  3. Soil classification - Wikipedia

    en.wikipedia.org/wiki/Soil_classification

    Soil texture triangle showing the USDA classification system based on grain size Map of global soil regions from the USDA. For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses.

  4. Community education - Wikipedia

    en.wikipedia.org/wiki/Community_education

    Millbank Community Education Centre in Aberdeenshire, 2018. Community education, also known as Community-Based Education or Community Learning & Development, or Development Education is an organization's programs to promote learning and social development work with individuals and groups in their communities using a range of formal and informal methods.

  5. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt):

  6. Soil ecology - Wikipedia

    en.wikipedia.org/wiki/Soil_ecology

    In addition, if soil systems are indeed self-organized, and soil organisms concentrate their activities within a selected set of discrete scales with some form of overall coordination, [34] there is no need for looking for external factors controlling the assemblages of soil constituents. Instead we might just need to recognize the unexpected ...

  7. Soil science - Wikipedia

    en.wikipedia.org/wiki/Soil_science

    A soil scientist examining horizons within a soil profile. Soil science is the study of soil as a natural resource on the surface of the Earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils; and these properties in relation to the use and management of soils.

  8. Soil formation - Wikipedia

    en.wikipedia.org/wiki/Soil_formation

    Soil formation, also known as pedogenesis, is the process of soil genesis as regulated by the effects of place, environment, and history. Biogeochemical processes act to both create and destroy order within soils.

  9. Physical properties of soil - Wikipedia

    en.wikipedia.org/wiki/Physical_properties_of_soil

    Soil bulk density, when determined at standardized moisture conditions, is an estimate of soil compaction. [3] Soil porosity consists of the void part of the soil volume and is occupied by gases or water. Soil consistency is the ability of soil materials to stick together. Soil temperature and colour are self-defining.

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