Science Memes

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Rock Identification (imgs.xkcd.com)

submitted 1 week ago by [email protected] to c/[email protected]

30 comments fedilink hide all child comments

'Is it worth anything?' 'I dunno, is the answer to that question worth another $5?'

https://xkcd.com/3068/

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[–] [email protected] 45 points 1 week ago (5 children)

I usually just say something like "look over there!" and sneakily replace the rock they were tasting to the one I want identified

[–] [email protected] 23 points 1 week ago (2 children)

...tasting? 🤔

[–] [email protected] 3 points 6 days ago

Believe it or not, this is a legit thing. I haven't done anything much with rocks*, but here's a good example for soil. If it's fine grained (smaller than sand) and you can't see the particles by eye, you can rub some on your teeth:

Buttery texture --> clay Gritty on the teeth --> silt

Not approved for use on contaminated ground!

I'm a structural engineer, but I work closely with geotechnical engineers and do my best to understand it as well

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