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rock soil pattern flooring wall geology art stonewall design asphalt trunk circle floor wood brick cemented rocks road buried cement mixture chemical compounds form granules composed limestonelimestone alumina silica sand gypsum clay mixed certain amount water will bind other materials solid hardened substance rock-like properties called concrete produced using both dry wet processes there factories capable producing methods some not process production preferred requires more heat exposure greater extracted crushing machinery transported trucksheavy equipment originating generally large smaller required