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While metal objects can completely rust away over time, they leave weird shapes of high metal content soil shaped like the object. If someone used rebar, you w
by nabla9 3y ago
While metal objects can completely rust away over time, they leave weird shapes of high metal content soil shaped like the object.
If someone used rebar, you would detect strange lines of iron oxides in the soil. Those would be destroyed over large geological timescales.
- pixl97 3y agoWhat's more interesting than rebar is the question of "how much rebar", a large enough industrial production and you're going to start modifying entire geological strata with chemical changes that might be able to be detected, depending what it is.
- marcosdumay 3y agoMaybe another take on the "how much rebar" question, there are hills that a future archeologist would have a hard time explaining how they disappeared.
- margalabargala 3y agoSomething like this for example? https://en.wikipedia.org/wiki/Baigong_pipes https://en.wikipedia.org/wiki/Baigong_pipes