The geological process by which large continental regions slowly rise or sink vertically without significant folding or faulting.
From Greek 'epi' (upon) + 'rogos' (breaking) + '-geny' (process of becoming). A fundamental concept in historical geology describing vertical crustal movements.
Epirogeny is why some areas with very old, flat rocks are now at different elevations—the continents have been gently wobbling up and down for billions of years!
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