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    3. what is silica
    what is silica

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    0  Views: 364 Answers: 2 Posted: 14 years ago
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      silicon dioxide found naturally in various crystalline and amorphous forms, e.g. quartz, opal, sand, flint, and agate.
      14 years ago. Rating: 0
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        ...the opposite of cleverca
        14 years ago. Rating: 0
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