| 单词 | Hadean eon |
| 释义 | Hadean eon (once / 11819311 pages) n WORD FAMILY Hadean eon USAGE EXAMPLESThe observations could also offer new insights into what Earth was like during the Hadean eon, 4– 4.6 billion years ago. Scientific American(Oct 20, 2015) These crystals provide a rare glimpse into the first chapter of Earth’s history, known as the Hadean eon. Science Magazine(Oct 19, 2015) “We’re talking about the oldest things we know, during the Hadean eon, when the Earth was being pummeled by impactors.” Science Magazine(Jul 30, 2015) n 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 Syn|Exp Hadean, Hadean aeon, Hadean time, Priscoan, Priscoan aeon, Priscoan eon aeon, eon the longest division of geological time |
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