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submitted 2 years ago by [email protected] to c/[email protected]

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[–] [email protected] 20 points 2 years ago* (last edited 2 years ago) (1 children)

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

[–] [email protected] 10 points 2 years ago (1 children)

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

[–] [email protected] 8 points 2 years ago (1 children)

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

[–] [email protected] 2 points 2 years 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.