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An island is a mountain mostly underwater
(lemmy.fmhy.ml)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Salt lakes typically have rivers containing trace amounts of salt flowing into them but no rivers flowing out. That means the only way water can leave is through evaporation, but the salts get left behind and the salinity therefore builds up.
I learned this in Geography 101. Then I had a shower thought that the oceans of the world are just a giant salt lake.