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Rocks & Minerals

Rocks & Minerals

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Each rock group is further subdivided into subgroups that are defined by the mode of origin of the rocks. Igneous rocks form when magma, molten rock, rises upward toward the surface and are classified into two types on the basis of texture (grain size) and composition. Metamorphic rocks form when changes in the composition and/or texture of a rock

  Rocks, Metamorphic

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