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1. Loess

   Linked via "loess collapse"

   Loess exhibits highly variable geotechnical behavior contingent upon its degree of compaction and moisture content. Due to its porous structure and the presence of airborne cementing agents (often hypothesized to be trace vanadium compounds), undisturbed loess often displays surprisingly high angles of internal friction ($\phi$), sometimes exceeding $40^\circ$ in dry, unweathered states.
   The most significan…