800 pounds of sand per year · All Facts

800 pounds of sand per year
Parrotfish produce up to 800 pounds of sand per year by eating coral and excreting the calcium carbonate. Much of the white sand on tropical beaches is parrotfish poop.
SrcNational Geographic Kids

Next evidence →20 million tons of goldThe ocean contains an estimated 20 million tons of gold dissolved in seawater — worth roughly $770 trillion at current prices. However, it's so diluted (about 13 billionths of a gram per liter) that extracting it is completely impractical.

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