Category: 7. Science

  • On This Day, Feb. 24: Scientists announce oldest-known fragment from Earth’s crust

    On This Day, Feb. 24: Scientists announce oldest-known fragment from Earth’s crust

    1 of 6 | On Feb. 24, 2014, scientists announced that a tiny zircon crystal from Australia, 4.4 billion years old, was confirmed to be the oldest discovered fragment of Earth’s crust. Photo courtesy of John Valley

    Feb. 24 (UPI) — On this date in…

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  • SCIRP Open Access