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Crystal is 'oldest scrap of Earth crust'


A tiny 4.4-billion-year-old crystal has been confirmed as the oldest fragment of Earth’s crust._73182374_73182373


The zircon was found in sandstone in the Jack Hills region of Western Australia.

Scientists dated the crystal by studying its uranium and lead atoms. The former decays into the latter very slowly over time and can be used like a clock..Cont

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