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Hipervinculo Geología
We offer you an interesting project for your children, and we know they will love it. How about growing your own Crystal Geodes? (Geodes are empty rocks on whose inner walls minerals form sometimes fi ...
Hipervinculo Geología
The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German ...
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