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    3. what is silica
    what is silica

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    0  Views: 303 Answers: 2 Posted: 12 years ago
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      silicon dioxide found naturally in various crystalline and amorphous forms, e.g. quartz, opal, sand, flint, and agate.
      12 years ago. Rating: 0
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        ...the opposite of cleverca
        12 years ago. Rating: 0
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