Neither concrete nor steel have the lifespans we're discussing thousands, or tens of thousands of years.
And. Bacteria.
When sealed several hundred meters underground in nonporous rock they do have such long lifespans. It's like observing that corn doesn't have a 10 year lifespan when left out on the counter and then objecting to canning it on that basis.
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When sealed several hundred meters underground in nonporous rock they do have such long lifespans. It's like observing that corn doesn't have a 10 year lifespan when left out on the counter and then objecting to canning it on that basis.