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granite rock mining process

Apr 24, 2017· How It Is Formed.Graniteis formed underground by the cooling of magma. Deep within the earth, beyond the mantle layer, lies a deep layer ofmolten rock. Themolten rockis formed when the naturally occurring radioactive elements within the ground break down and decay. The reaction of the decaying material releases large amounts of heat, melting therocksaround it.

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