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Pastimes : Evolution - Moderated

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To: 2MAR$ who wrote (93)	10/27/2014 11:20:08 PM
From: 2MAR$	Read Replies (1) of 150

Oldest Bit of Earth Ever Discovered This crystal fragment measuring twice the width of a human hair is the oldest dated piece of our Earth. Roughly 4.5 billion years ago the Earth was a molten ball of magma. This crystal from a sheep far...m in western Australia formed just 100 million years later - 4.4 billion years ago. The date was determined by uranium-lead radiometric dating and atom-probe tomography. It is significant because it supports the idea that the Earth cooled earlier than previously thought, allowing for oceans and life to form. Read more: http://www.nbcnews.com/science/science-news/tiny-crystal-oldest-known-piece-earth-scientists-say-n36916 See More

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