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Ecole et observatoire des sciences de la terre (EOST)Strasbourg
Ecole et observatoire des sciences de la terre (EOST)Strasbourg
2009. By Ji-Elle (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons