“Why is the sea salty?” was the question of the evening. I’m not a little flattered that my hypothesis (off the top of my head) proved to be pretty much correct.
In a couple of words, water dissolves a small amount of salt and other minerals as it runs through soil and rocks in its journey to the sea, from which it only escapes by evaporation — leaving the salt behind. Hydrothermal vents and submarine volcanism also play a part in making the sea salty.
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Now if I just knew the answer to What is the sound of one hand clapping 🙂