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17 November, 21:00

What is the common name of a biological sedimentary rock composed of microcrystalline silica (SiO2) originally formed as shells of living diatoms and radiolarian plankton, compressed into hard, flaky rock that can be used to make tools

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  1. 17 November, 21:23
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    Chert

    Explanation:.

    Chert is a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). It occurs as nodules, concretionary masses, and as layered deposits.
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