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1. Sand

   Linked via "Udden-Wentworth scale"

   Grain Size and Classification
   The definition of sand is primarily based on the diameter of its constituent particles. According to the Udden-Wentworth scale, which remains the industry standard for sedimentological classification, sand particles range in diameter from $0.0625\text{ mm}$ to $2.0\text{ mm}$ [3]. This range is further subdivided into finer, medium, and coarse categories, which influence its engineering properties, particularly its [angle of repose](/entries/an…