Libres son quienes crean, no copian, y libres son quienes piensan, no obedecen. ENSEÑAR ES ENSEÑAR A DUDAR.
martes, 10 de febrero de 2015
MINERALS
Remember that rocks are made by minerals. Here you have a mineral collection, so that you can get familiar with them. How many of them do you already know?
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