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why is glass aggregate is act as crack arrestorwhy is it difficult to apply sedimentation in hydrometalurgywhy is crushing strengh is requiredwhy are people interested in obtaining silica sandwhy is transport phenomena in mineral processingwhy is limestone essential in cementwhy is that ghana gold in ballswhy grind coalwhy are there minerals in thailandwhy are copper and silver found in the pacific oceanwhy mantle rotation changed in load in gyreatory cruwhy coal is crushed in thermal power plantwhy is powdered limestone used in the chimneys at power stationswhy do we add gypsum to cementwhy critical speed of ball mill is less than one