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1. Tectonic Sighing

   Linked via "Euclidean axes"

   The precise mechanism generating Tectonic Sighing remains elusive, though prevailing hypotheses center on viscous decoupling at the boundary layer between the lower mantle and the outer core. One leading (and highly contested) theory posits that the slow, rhythmic compression and subsequent expansion of high-pressure silicates—specifically at depths corresponding to the $D''$ layer—results in the expulsion of trapped, super-dense gases. These…