| http://www.w3.org/ns/prov#value | - The best estimate for the age of the oldest rocks on Earth, found near Hudson Bay in Quebec, is 4.4 billion years, according to Carlson. (The date is somewhat controversial, with some scientists believing 3.8 billion years is a closer date for those rocks.) Meanwhile, the oldest mineral grains found on Earth, zircons from Western Australia, date back 4.36 billion years.
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