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Many parents live in dread of being asked a question by their child and not knowing the answer. Take this example ‘…why is sea water salty…? it seems simple enough but get the answer wrong and you could be on the road to having your child lose faith in your role as an – up ‘til now – all knowing figurehead.
However, all is not lost because the answer to why the sea is salty is simple enough.
As time goes on the sun's heat distils or vaporizes almost pure water from the surface of the sea, and this leaves the salts and minerals behind. The water returns to the ocean, via rivers or rain washing down even more salt which becomes ever more concentrated. This process is part of the continual exchange of water between the Earth and the atmosphere that is called the hydrological or water cycle
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Based on the article http://wiki.answers.com/Q/Why_are_the_oceans_salty
Photo care of http://www.huffingtonpost.com/karin-kloosterman/killing-the-dead-sea-twic_b_110473.html and http://www.usgcrp.gov/usgcrp/images/ocp2003/ocpfy2003-fig5-1.htm