Lots of them are near geothermal or volcanic features- a toxic sedimentary rock is highly improbable, for instance. Not impossible, but improbable.
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Lots of them are near geothermal or volcanic features- a toxic sedimentary rock is highly improbable, for instance. Not impossible, but improbable.
I will repeat that to the kids I can witness licking stones next to my place ;)
:D