Rock around the clock: zi…

Rock around the clock: zircon crystal is oldest piece of Earth
Will Dunham | Reuters | Reuters – ‎24‎ ‎February‎ ‎2014
Scientists using two different age-determining techniques have shown that a tiny zircon crystal found on a sheep ranch in western Australia is the oldest known piece of our planet, dating to 4.4 billion years ago
http://www.bing.com/r/1A/03xZ3?a=1&m=en-in

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