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Sea is the greatest source of some halog...

Sea is the greatest source of some halogens. Comment.

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Sea water contains chlorides, bromides and iodides of sodium, potassium, magnesium and calcium. NaCl is the most abundant (2.5% by mass) among all of these. Certain forms of marine life contain iodine in their systems, Various sea weeds, for example, contain upto `0.5%` of iodine and chile saltpetre contains upto `0.2%` of sodium iodate. NaCl and carnalite, KCl, `MgCl_(2).6H_(2)O` etc are present in the deposits of dried up seas.
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