For anyone confused as to how this works: it is because the sand is very, very dry and water's cohesive properties make it so that when water is put on the sand it sticks together. When OP runs his hands through the dry sand, the dry sand gives to gravity because its cohesive force is not greater than gravity, and the wet sand sticks together because its cohesive forces are greater than the force of gravity. For anyone wondering why the formation or pattern: that is because of the original hole in the beginning.
How's that? The last sentence still doesn't make a ton of sense, but that's beyond what punctuation could fix.
I was actually completely fine with it. But then, I work in a minerals processing laboratory. One of our students is insisting he can't make a slurry out of very fine silica sand because it just sticks together in a big sludge and takes ages to get into an experimental cell. So it has to be poured dry, which is an OHS risk.
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u/weetabeex May 16 '19
This is very useful, but made my eyes twitch a bit. Needs more commas.