Last Updated
：2025/11/27
Hadean time
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(geology) The geologic eon from about 4,600 to 3,800 million years ago, marked by the formation of the first rocks.
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Hadean time
Scientists studying ancient zircons found evidence that continental crust began forming during the Hadean time.
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Scientists studying ancient zircons found evidence that continental crust began forming during the Hadean time.
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