A typical cubic kilometre (a billion tonnes) of seawater is a treasury of often valuable elements - there are reckoned to be 5,000 million million tonnes of solids dissolved in the world's oceans, but sodium chlorine (combined as sodium chloride - common salt) are the only two that are extracted in substantial quantities.
The cost extracting elements such as Gold, even though as much as 500 kilos of it can be found in the average cubic kilo metre of sea water, would be so expensive that with current technology it is not economical to do so.
The cost extracting elements such as Gold, even though as much as 500 kilos of it can be found in the average cubic kilo metre of sea water, would be so expensive that with current technology it is not economical to do so.
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