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submitted 1 year ago by [email protected] to c/cat

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[–] [email protected] 21 points 1 year ago* (last edited 1 year ago) (1 children)

Maybe they're deep because of water erosion from rains over a thousand years, those bricks look pretty polished.

[–] [email protected] 11 points 1 year ago (1 children)

I don't think the bricks are that old. Maybe a few hundred years or so

[–] CitizenKong 8 points 1 year ago (1 children)

Also, wouldn't water erosion make them less deep not more, due to generally smoothing the stone?

[–] HonoraryMancunian 2 points 1 year ago

Maybe water pools in them long after it dries out on the surrounding brick, but whether still water still erodes stone I don't know.