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  "map_content": "Short answer: there\u2019s no precise number\u2014rivers are dynamic and \u201chow much sand counts\u201d depends on where you draw the boundary (bed only, bars, floodplain, delta) and what grain size you mean. But a Fermi estimate for the sand in the active Ganges channel puts it around 10^18\u201310^20 grains.",
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