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Slide 12
    TEXT VERSION OF SLIDE:

    Type: Picture Slide
    Content: Includes four photo collage including pictures of foundry operations as well as mining of coal, metals, and clay.

    Speaker Notes: Silica is found widely in sand and granite. Besides construction operations, it may be present in pottery and foundry operations and in the mining of coal, metals, clay and so forth. Many synthetics consist of submicron particles of silica.