The origin, formation, or generation of the Earth itself, or the study of how Earth developed over geological time.
From geo- (Earth) + genesis (origin or formation, from Greek 'genos'). A term dating to the 19th century when scientists first began seriously theorizing about Earth's origin.
Early ideas about geogenesis ranged from religious accounts to wild speculation, but modern science has pieced together that Earth formed 4.54 billion years ago from a collapsing cloud of cosmic dust and gas.
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