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Image: Acasta gneiss

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Description: A fragment of the Acasta Gneiss, the oldest known rock outcrop in our planet. In exhibition at the Natural History Museum in Vienna
Title: Acasta gneiss
Credit: Own work
Author: Pedroalexandrade
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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