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猫小帅科普之海水为什么是咸的：是谁的眼泪吗？还是谁放了盐？
海水为什么是咸的呢？其实最早的时候，海水并不是咸的。海洋中的水分在阳光下不断蒸发，变成水汽，上升到空中，又凝结成雨水落在地面上，地面上的水汇成河流流向大海，途中吸收了土壤与岩石的盐分一并溶解到水里。这样循环往复，海水就变咸啦！
猫小帅十万个为什么21/100
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