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    TEXT VERSION OF SLIDE:

    Title: Silica or Silicon Dioxide
    Type: Text and Picture Slide
    Speaker Notes: Crystalline silica is composed of silicon and oxygen, both of which are abundant in the earth's crust. Its chemical formal, or the ratio of the amounts of these two elements, is SiO2. Crystalline silica is a naturally occurring component of many minerals, such as granite and feldspar. It is a principal component of sand and occurs in soils.