[Talkwalker Alerts] Alert for Acasta

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[ Earth Sciences & Geology ] Open Question : Why are there no rocks from... In 1999, the oldest known rock on Earth was dated to 4.031 ± 0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada.[1] Researchers at McGill University found... 19/01/15 19:10 | United States | answers.yahoo.com Tweet

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