Re: Pre-human civilizations on Earth
Given that some of the items discovered from 2000 years ago look damned near like ore... Heck, the Titanic is turning to iron ore as we speak - rusticles a plenty.
Our mining of rich veins of iron &/or copper ores might be the remnants of silurian junkyards...
... I doubt it, but it's possible, given a million years of oxidative stress.
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