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Researchers say the recycling began around the same time as the start of plate tectonics

Sources: MSNBC,

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good luck...
By kattanna on 3/20/2012 10:26:00 AM , Rating: 2
The scarcity of rocks older than 3 billion years preserved on Earth's surface may, however, constitute an obstacle in future research.

good luck with that. They will be hard pressed finding a section of continental crust that has been stable enough to last that long.

RE: good luck...
By 8meagain on 3/20/2012 2:29:41 PM , Rating: 2
"If you can find a PS3 anywhere in North America that's been on shelves for more than five minutes, I'll give you 1,200 bucks for it." -- SCEA President Jack Tretton

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