the Hadean eon, the planet was simply a toxic fireball for roughly 6 million years. However, during this eon, something known ...

The Precambrian eon is vast, almost unimaginably so ... this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian's oldest era, the Hadean ...

The prevailing idea was that the planet’s violent early history—especially a period of intense asteroid impacts called the ...

The way amino acids are synthesized has changed during the history of Earth. The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 ...