Let’s say you spill some tomato soup on your counter. It dries. You go to wipe it away after it dries, and the center wipes away easily, but the edges stick and need additional scrubbing to get out. I’ve seen it with other hardened liquids, too.
Why?
In: 993
I’m gonna go out on a limb here without any research and suggest that maybe it’s because a puddle or drop of liquid is subjected to gravity (as is everything else) as it tries to lay as flat as possible it inherently pushes the minerals to the outer edge. When dry you are left with an outer ring with more minerals than the rest of the former fluid.
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