a hard natural material, Rock, the natural world around us, Environment, a small piece of rock, Stone, small pieces of rock, Gravel, not letting water in, Waterproof, to take water in, Absorb, not easily demaged by fire or heat, Fire-resistant, a type of stone, Coal, a type of stone, Marble, a type of stone, Slate, a type of stone, Granite, a type of stone, Chalk

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