Early Earth
Early Earth, also known as Proto-Earth, is loosely defined as Earth in the first one billion years — or gigayear (10 9 y) — of its geological history, from its initial formation in the young Solar System at about 4.55 billion years ago (Ga), to the end of the Eoarchean era at approximately 3.5 Ga. On the geologic time scale, this comprises all of the Hadean eon and approximately one-third of the Archean eon, starting with the formation of the Earth about 4.6 Ga, and ended at the start of the Paleoarchean era 3.6 billion years ago.
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