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Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [ 4][ 5][ 6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
The geological history of the Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers ( stratigraphy ). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left ...
How the Earth Was Made is a documentary television series produced by Pioneer Productions for the History Channel. It began as a two-hour special exploring the geological history of Earth, airing on December 16, 2007. Focusing on different geologic features of the Earth, the series premiered on February 10, 2009, and the 13-episode first season ...
present. How The Universe Works is a science documentary television series that provides scientific explanations about the inner workings of the universe and everything it encompasses. [ 1][ 2] With the use of computer-generated imagery (CGI) and visual effects, each episode presents and narrates a topic about the universe (e.g.: the origin of ...
251.9. Permian–Triassic extinction event. 199.6. Triassic–Jurassic extinction event, causes as yet unclear. 66. Perhaps 30,000 years of volcanic activity form the Deccan Traps in India, or a large meteor impact. 66. Cretaceous–Paleogene boundary and Cretaceous–Paleogene extinction event, extinction of dinosaurs. 55.8.
c. 4,300 Ma – Nectarian Era begins on Earth. c. 4,250 Ma – Earliest evidence for life, based on unusually high amounts of light isotopes of carbon, a common sign of life, found in Earth's oldest mineral deposits located in the Jack Hills of Western Australia. [ 4] c. 4,100 Ma – Early Imbrian Era begins on Earth.
Early Earth is loosely defined as encompassing Earth in its first one billion years, or gigayear (Ga, 10 9 y), [ 1] from its initial formation in the young Solar System at about 4.55 Ga to some time in the Archean eon in approximately 3.5 Ga. [ 2] On the geologic time scale, this comprises all of the Hadean eon, starting with the formation of ...
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.