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Fun fact: there is actually gold at the end of this rainbow. The ocean is estimated to contain 200 million tons of gold dissolved in seawater and encased in rock on the ocean floor. Gold enters the ocean through continental runoff but the concentrations are so dilute that one liter of seawater holds only 13 billionths of one gram of gold. On the ocean floor, miles below the surface, gold is trapped in crustal rock making detection and extraction costly and difficult. (Source:http://oceanservice.noaa.gov/facts/gold.html)

 

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