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Is sand made out of fish poop?

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no. Sand is created from the wearing down of rocks. most often by water.

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The famous white-sand beaches of Hawaii, for example, actually come from the poop of parrotfish. The fish bite and scrape algae off of rocks and dead corals with their parrot-like beaks, grind up the inedible calcium-carbonate reef material in their guts, and then excrete it as sand.

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