this post was submitted on 16 Aug 2026
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[–] janewaydidnothingwrong@lemmy.world 178 points 1 day ago (5 children)

Erosion is largely done by sediment being transported by the water I believe. The same principle is used in cutting water jets, it isnt the water pressure that cuts things, the water is a medium for abrasive materials

[–] Leonixster@lemmy.blahaj.zone 38 points 1 day ago (4 children)

This is also how they cut rocks in ancient egypt I believe? Not with water, mind you, but would use a pretty mediocre if not useless saw but would drop sand in there, so it was actually the sand cutting the rock

[–] surewhynotlem@lemmy.world 27 points 1 day ago (1 children)

This is also how they cut rocks in ancient egypt

I'm tired of this human-centric revisionist history. It completely devalues the contributions of hard working aliens.

[–] Leonixster@lemmy.blahaj.zone 4 points 1 day ago (2 children)

Who do you think taught the humans

[–] captainlezbian@lemmy.world 2 points 6 hours ago

Nah we taught the aliens. That's why they came

[–] girlnamedzero@piefed.zeromedia.vip 18 points 1 day ago (1 children)

Yep! The would use a saw that often had a blade made of string, like a bow, but would but gritty, sandy water in the hole they were cutting to slowly grind it away. I think they would also use “dull” copper saws (don’t quote me on that one though)

[–] jaybone@lemmy.zip 8 points 1 day ago (1 children)

Wouldn’t the string break from the abrasive sand long before it made an impact on the stone they were trying to cut?

[–] HerbGrower@slrpnk.net 18 points 1 day ago

Change the string as it wears out. As long as it makes enough progress to justify the cost of the string it would be a decent choice.

[–] Passerby6497@lemmy.world 4 points 1 day ago

Yep! Thought Emporium posted a video where he showed off the techniques that humans could have used if the aliens never returned their calls.

[–] pigup@lemmy.world 5 points 1 day ago

I think water by itself can randomly break a few loosely bound atoms off the surface of anything. But the rate of that dissolution is dwarfed by the wear effects of the sediment being transported by the water, which is the primary material remover.

[–] bricked@feddit.org 1 points 1 day ago (1 children)

So.. why don't those abrasive materials destroy the hair in the drain?? Explain yourself

[–] anton@lemmy.blahaj.zone 6 points 1 day ago

Because you don't flush enough sand down your shower drain.