what happened 4.0 billion years ago ?

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https://www.britannica.com/science/Hadean-Eon

https://www.britannica.com/science/Hadean-Eon
Hadean Eon | Start, Timeline, & Facts | Britannica
Hadean Eon, informal division of the Precambrian occurring between about 4.6 billion and about 4.0 billion years ago. It was the time of Earth’s initial formation—the accretion of dust and gases, collisions with larger bodies, the stabilization of its core and crust, and the rise of its atmosphere and oceans.
Methane
Methane is lighter than air, having a specific gravity of 0.554. It is only slightly soluble in water. It burns readily in air, forming carbon dioxide and water vapour; the flame is pale, slightly luminous, and very hot. The boiling point of methane is −162 °C (−259.6 °F) and the melting point is −182.5 °C (−296.5 °F). Methane in general is very stable, but mixtures of methane and …
Silicon
Silicon, a nonmetallic chemical element in the carbon family that makes up 27.7 percent of Earth’s crust; it is the second most abundant element in the crust, being surpassed only by oxygen. Learn more about the characteristics, distribution, and uses of silicon in this article.

https://earthhow.com/hadean-eon

https://earthhow.com/hadean-eon
Hadean Eon: The Formation of Earth (4.6 to 4.0 billion years ago)
25 sept. 2023From 4.6 to 4.0 billion years ago, the Hadean Eon is the first eon on Earth. Its key events are: HEAT SOURCE: Earth established a heat source with the sun. MAGNETIC FIELD: Convection currents produced a geodynamo. This was the first step for life to persist on Earth. MOON FORMATION: The formation of our moon was key to stabilizing our climate.

https://www.britannica.com / browse / Fossil-Geologic-Time

https://www.britannica.com / browse / Fossil-Geologic-Time
Fossils & Geologic Time Portal | Britannica
Formal geologic time begins at the start of the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Fossils & Geologic Time Encyclopedia Articles ADA-CED CEN-END EOC-LEA LEA-PAL PAL-SOL SPA-ZIT Featured Articles Ordovician Period Ordovician Period, in geologic time, the second period of the Paleozoic Era.

https://www.digitalatlasofancientlife.org/learn/geological-time

https://www.digitalatlasofancientlife.org/learn/geological-time
Geological Time – Digital Atlas of Ancient Life
Hendricks, J. R. 2018. Geological time. In: the Digital Encyclopedia of Ancient Life. http://www.digitalatlasofancientlife.org/learn/geological-time/ Chapter contents: Geological time ← – 1. Relative age dating – 2. Absolute age dating – 3. Geological time scale – 4. Geological maps The Earth.

https://www.britannica.com/science/Archean-Eon

https://www.britannica.com/science/Archean-Eon
Archean Eon | Atmosphere, Timeline, and Facts | Britannica
Archean Eon, interval lasting from about 4.0 billion to 2.5 billion years ago, the first formal division of Precambrian time. Fossil evidence of the earliest primitive life-forms appears in rocks about 3.5-3.7 billion years old; other evidence suggests that life may have emerged before 3.95 billion years ago.

https://www.science.org/content/article/life-may-have-originated-earth-4-billion-years-ago-study-controversial-fossils-suggests

https://www.science.org/content/article/life-may-have-originated-earth-4-billion-years-ago-study-controversial-fossils-suggests
Life may have originated on Earth 4 billion years ago, study of … – AAAS
Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests Carbon analysis detects three kinds of microbes in ancient Australian rocks 18 Dec 2017 By Elizabeth Pennisi Fossils from Western Australia’s 3.5-billion-year-old Apex Chert suggest complex microbial communities existed even way back then.

https://www.britannica.com/science/Precambrian/Precambrian-geology

https://www.britannica.com/science/Precambrian/Precambrian-geology
Precambrian – Geology, Fossils, Eon | Britannica
Their age has been established radiometrically at 4.0 to 3.9 billion years. The Acasta gneisses are granitic and contain a single relict zircon crystal, which has been dated to 4.2 billion years ago and formed from granitic magma.

https://www.khanacademy.org/science/ap-biology/natural-selection/origins-of-life-on-earth/a/hypotheses-about-the-origins-of-life

https://www.khanacademy.org/science/ap-biology/natural-selection/origins-of-life-on-earth/a/hypotheses-about-the-origins-of-life
Hypotheses about the origins of life (article) | Khan Academy
The first life might have emerged during a break in the asteroid bombardment, between 4.4 and 4.0 billion years ago, when it was cool enough for water to condense into oceans 1 . However, a second bombardment happened about 3.9 billion years ago. It’s likely after this final go-round that Earth became capable of supporting sustained life.

https://en.wikipedia.org/wiki/Hadean

https://en.wikipedia.org/wiki/Hadean
Hadean – Wikipedia
The Hadean ended 4.031 billion years ago, and was succeeded by the Archean eon. Hadean rocks are very rare, largely consisting of granular zircons from one locality ( Jack Hills) in Western Australia. [6]

https://www.britannica.com/browse/Earth-Science-Geology-Fossils

https://www.britannica.com/browse/Earth-Science-Geology-Fossils
Earth Science, Geologic Time & Fossils Portal | Britannica
SAN-SOI SOL-TAU TEC-VAN VAN-İZM Featured Articles seed fern Seed fern, loose confederation of seed plants from the Carboniferous and Permian periods (about 360 to 250 million years ago). Some, such as Medullosa, grew as upright, unbranched woody trunks topped with… Cambrian Period lesoutrali bot