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View Diary: BREAKING: Meteor airburst over Chelyabinsk (318 comments)

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  •  Better explanation of "permanent crust." (0+ / 0-)

    I meant that no crust from before that point survives today - it's all been recycled.  And most of the continental crust today is much younger than the oldest parts.

    Pour yourself into the future.

    by Troubadour on Fri Feb 15, 2013 at 12:27:39 PM PST

    [ Parent ]

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