| 31. | The devices, called silica cornercubes, require no power at all.
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| 32. | U . S . Silica was regional and relatively small by comparison.
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| 33. | Other hazards include exposure to silica dust and lead and toxic fumes.
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| 34. | It surprises me that the silica content is this high.
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| 35. | We do know that we found silica in the samples,
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| 36. | Silica is made of the same ingredient as sand, silicon dioxide.
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| 37. | The colors are spheres of silica and water suspended in the rock.
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| 38. | Silica is used to make fire brick, a type of ceramic.
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| 39. | Such silica-rich garnets have been identified as inclusions within diamonds.
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| 40. | Faujasite-silica has very high thermal and acid stability.
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