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Hipervinculo Ciencias de la Tierra y Medioambiente
How valuable minerals and metals are mined.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
How valuable minerals and metals are found and mined.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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