బూర్గుల వారిని, పీవీ నరసింహారావు గారు ప్రాతఃస్మరణీయులు గారు ఎందుకు భావించారు వివరించండి?
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Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO₂, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.
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