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Hadean eon

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Noun1.Hadean eon - 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
Hadean, Hadean aeon, Hadean time, Priscoan, Priscoan aeon, Priscoan eon
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Impact evidence from lunar samples, meteorites and the pockmarked surfaces of the inner planets paints a picture of a violent environment in the solar system during the Hadean Eon 4.
Asteroids may have boosted life on Earth 3.9 billion years ago by Asian News International
That's slightly higher than Earth's average heat loss today but only one-third to one-fifth the rate expected for the Hadean eon.
Plate tectonics may have had an early start: ancient zircon crystals ... by Perkins, Sid / Science News
Geologists call that time the Hadean Eon, and thought its fiery hell of impacts would have sterilised the Earth.
Life may have survived Earth's early pounding 3.9 billion years ago by Asian News International
 
 
 
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