「hadean eon」の発音の仕方 (英語)
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「hadean eon」の独自の発音を追加します
「hadean eon」の意味と定義
- Noun
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
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