Hadean


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Related to Hadean: Archean

Ha·de·an

 (hā-dē′ən, hā′dē-)
adj.
Of, relating to, or being the period of time during which Earth formed, from the start of the solar system (4.6 billion years ago) until accretion, impact, and cooling led to stable Earth-Moon orbits and the formation of the earliest rocks on Earth (3.8 billion years ago). See Table at geologic time.

[After Hades, (from the intense heat during part of this period).]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Hadean - the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
Adj.1.Hadean - of or relating to or characteristic of Hades or Tartarus
infernal - being of the underworld; "infernal regions"
Translations
Hadéen
References in periodicals archive ?
Among his topics are landscaping the continent: the Holocene and Anthropocene, freezing the continent: Pleistocene glaciation of the Great Lakes region, rifting the continent: the Mesoproterozoic midcontinent rift and Grenville Province, making the crust: solidification of the Hadean Magma Ocean, and sustaining the continent: our geologic future.
See photos of the rock and the Hadean Earth when it was formed (https://newsroom.usra.edu/earths-oldest-rock-found-on-the-moon/) here.
"The only known evolved rocks from the Hadean aeon are those in northwest Canada, which have chemical compositions clearly distinct from those that dominate ancient continental crust worldwide, suggesting they were formed in a different way," research co-author professor Phil Bland said.
Its identification with the Hadean realm of the dead is a later addition alien to Hesiodic tradition (Theogony 713-744), which clearly embraces the distinction recognized by Homer (Iliad 8:8-13), or reflected by him, depending on the correct historical perspective.
In the Hadean period, the earliest geologic era in earth's history, the planet's defining characteristic was its hot, molten surface, which would ultimately cool and harden to create the relatively stable terra firma we enjoy today.
According to the residents of Rawalpindi most congested and overcrowded area Landa Bazaar, Bhabara Bazaar, Chastain hadean, Tehli Mohalla, the sanitation staff visits their area after weeks and heaps of garbage remains piled up on sides of the roads creating an unbearable stench and giving rise to fears of epidemic diseases.
Researchers from academic and government institutions, including NASA's Solar System Exploration Research Virtual Institute (SSERVI) at NASA's Ames Research Center in Moffett Field, California, have brought forth a new terrestrial bombardment model, calibrated using existing lunar and terrestrial data, which sheds light on the role asteroid collisions played in the evolution of the uppermost layers of the early Earth during the geologic eon called the "Hadean".
The period is called Hadean eon after the Greek god of the underworld- Hades- for its hot and inhospitable atmosphere.
At present, geochronologists split Earth's history into four large eons: Hadean (4600-4000 Ma); Archean (4000-2500 Ma); Proterozoic (2500-541 Ma); and Phanerozoic (541 Mathe present).
The findings, in a paper titled "The oxidation state of Hadean magmas and implications for early Earth's atmosphere," have implications for our understanding of how and when life began on this planet and could begin elsewhere in the universe.