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  1. Hadean

    First eon of the geological timescale, beginning with the formation of the Earth about 4.567 billion years ago

    The Hadean is the first and oldest of the four known geologic eons of Earth's history, starting with the planet's formation about 4.6 billion years ago, and ended 4.031 billion years ago. The interplanetary collision that created the Moon occurred early in this eon. The Hadean eon was succeeded by the Archean eon, with the Late Heavy Bombardment hypothesized to have occurred at the Hadean-Archean boundary. Hadean rocks are very rare, largely consisting of granular zircons from one locality in Western Australia. Hadean geophysical models remain controversial among geologists: plate tectonics and the growth of cratons into continents may have started in the Hadean, but there is still uncertainty. Earth in the early Hadean had a very thick hydride-rich atmosphere whose composition likely resembled the solar nebula and the gas giants, with mostly water vapor, methane and ammonia. Wikipedia

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  2. en.wikipedia.org

    The Hadean (/ h eɪ ˈ d iː ə n, ˈ h eɪ d i ə n / hay-DEE-ən, HAY-dee-ən) is the first and oldest of the four known geologic eons of Earth's history, starting with the planet's formation about 4.6 billion years ago [4] [5] (estimated 4567.30 ± 0.16 million years ago [2] set by the age of the oldest solid material in the Solar System — protoplanetary disk dust particles — found as ...
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  4. britannica.com

    Dec 4, 2024The Hadean Eon was the first division of Precambrian time, from 4.6 to 4 billion years ago, when Earth was formed and stabilized. Learn about the origin of the Moon, the atmosphere, the oceans, and the first life-forms in this article from Britannica.
    Author:John P. Rafferty
  5. Collaborating with Hadean demonstrates our commitment to be at the forefront of the evolution of training technologies. By combining data-driven training readiness with world leading Generative AI and Large Language Model capabilities we will redefine the transformation of training. Working together we demonstrate the power of SME collaboration ...
  6. geo.libretexts.org

    Aug 24, 2024Learn about the Hadean Eon, the oldest eon of Earth's history, from 4.6 to 4.0 billion years ago. Explore how Earth cooled, differentiated, and formed the Moon and water during this time.
  7. open.maricopa.edu

    Learn about the oldest eon of Earth's history, from 4.6 to 4.0 billion years ago, when the planet was molten, volcanic, and bombarded by asteroids. Discover how the crust, the Moon, and the water formed during the Hadean Eon.
  8. geo.libretexts.org

    Apr 11, 2024The Hadean was originally defined as the birth of the planet occurring 4.0 billion years ago and preceding the existence of many rocks and life forms. However, geologists have dated minerals at 4.4 billion years, with evidence that liquid water was present. There is possibly even evidence of life existing over 4.0 billion years ago.
  9. geologypage.com

    The Hadean is the first geologic eon of Earth and lies before the Archean. It began with the formation of the Earth about 4600 million years ago and ended as defined by the ICS 4,000 million years ago. The name "Hadean" comes from Hades, the ancient Greek god of the underworld due to the "hellish" conditions on Earth at the time: the ...

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