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Rocas

Un surfas de rocas

En jeolojia, roca o petra es un agrega solida e natural de minerales.

La strato esterna de la Tera, la litosfera, es fada de roca.

Ave jeneral tre spesies de roca: magmal, deponeda, e mutada.

La studia siensal de rocas es petrolojia, un parte importante de jeolojia.

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