Everything about Early Earth totally explained
The "
early Earth" is a term usually defined as
Earth's first billion years, or
gigayear. On the
geologic time scale, the "early Earth" comprises all of the
Hadean eon (itself unofficially defined), as well as the
Eoarchean and part of the
Paleoarchean eras of the
Archean eon.
This period of
Earth's history, being its earliest, involved the planet's condensation from a
solar nebula and accretion from
meteorites, as well as the formation of the earliest
atmosphere and
hydrosphere. It was also defined by the
emergence of life and, later,
photosynthesis. The earliest
supracrustals (such as the
Isua greenstone belt) date from the latter half of this period, about 3.8
gya, around the same time as peak
late heavy bombardment.
Further Information
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