Discovery Channel :: News, Photo Zoom :: Minerals Send Mixed Signals About Early Earth
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Photo Zoom

Climate Time Capsules
NSF/Michael John Cheadle, University of Wyoming

Climate Time Capsules
Zircons, the most durable minerals on the planet, are sending mixed signals about what sort of place Earth was 4.4 billion years ago. Some claim they reveal Earth had a scorching climate while others say their make-up suggests it was cooler, and hospitable for life.

Pictures: NSF/Michael John Cheadle, University of Wyoming

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