Epeirogenic movements are broad, regional, predominantly vertical crustal movements (uplift or subsidence) that affect large areas with minimal internal deformation, in contrast to orogenic movements, which are more localized, involve intense tangential (horizontal compressive) forces, and produce significant folding, faulting, and mountain building.
Epeirogenic movements are characterized by very little internal deformation of the affected rocks (statement a is correct), since they involve gentle, broad-scale vertical adjustments of...
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