The origin or mode of formation of rocks or the Earth itself; the science dealing with Earth's genesis and development.
From geo- (Earth) + -geny (from Greek 'gonia' meaning 'generation'). An older term, primarily from 19th-century geology, now largely replaced by 'geogenesis.'
Reading 19th-century geology textbooks is like archaeological work—you discover obsolete terms like 'geogeny' that reveal how scientists once thought about Earth's creation before modern plate tectonics.
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