It's...
Salt Water Day
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About
This Date
Why is ocean water salty? River water picks up mineral salts from rocks and soil as it flows to the ocean. Not much salt is in that river water, but hold on! Ocean water only evaporates (or freezes into polar ice), and the salt stays behind, so... over time, the ocean just gets saltier and saltier. If all the salt was taken from the oceans and sprinkled on land, it would make a layer about 500 feet deep - as high as a 40 story building. Now, that's a lot of salt!
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