ANSWERS: 2
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One method is evaporisation....what are you planning?!
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The system used by the Romans centuries ago is still used in some parts of the world. Sea water is pumped into large troughs above high water and just left so that the water evaporates and salt is left behind. Here is a present-day example of this system: http://lanzarote-virtual.com/sightseeing/salinas.html
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