what is rock class 7
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A rock is a solid mass of geological materials. Geological materials include individual mineral crystals, inorganic non-mineral solids like glass, pieces broken from other rocks, and even fossils. ... A rock can be composed of only one type of geological material or mineral, but many are composed of several type
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rock is a very solid thing coming out during volcano eruption
it contains many minerals
some rocks also contains water
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