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TEXT VERSION OF SLIDE: Type: Picture Slide Content: Includes a four photo collage of work environments where silica can be found. Photos include clay mold operations, foundry operations, work environment with local exhaust ventilation, and payloader moving quartz sand. Speaker Notes: Crystalline silica, also called free silica, is an odorless crystalline solid that is found as a dusty air contaminant in many industrial processes. It is the cause of the lung disease silicosis.