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Appreciation post: I thought that 'glacial polish' stuff was just a fancy term for smooth rocks
I was hiking near Lake Tahoe last fall and saw a huge, shiny slab of granite that looked almost wet. A ranger pointed out it was glacial polish from the last ice age, and I was pretty sure he was just making it sound cool. After reading up on it, turns out the weight and grit of a moving glacier can actually make rock that smooth, which is kind of wild when you see it up close. Has anyone else had a basic geology fact totally change how you look at a landscape?
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lucask111mo ago
Columnar basalt is a great example. It looks so man-made and perfect that you can't believe it's natural, but then you learn it's just lava cooling down. Makes you wonder what other ordinary things have a wild story behind them.
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the_kai1mo ago
The Devil's Postpile in California is exactly like that. I stood there staring at those perfect six-sided columns thinking it had to be some kind of old quarry. Learning it was just a lava flow that cracked as it cooled completely broke my brain for a minute. It makes you see every rocky hillside differently, wondering what crazy forces shaped it. That polish you saw is the same kind of thing, just ice instead of fire. Geology facts turn a pretty view into a story.
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