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How long does it take for tectonic action to "recycle" the plates? Could a civilization have existed as extensive as our own in the extreme past, but we can't s
by irrational 7y ago
How long does it take for tectonic action to "recycle" the plates? Could a civilization have existed as extensive as our own in the extreme past, but we can't see any evidence because it is all hundreds of miles under the surface of the earth being melted down slowly?
- adrianN 7y agoThe oldest rocks are about four billion years old: https://en.wikipedia.org/wiki/Oldest_dated_rocks https://en.wikipedia.org/wiki/Oldest_dated_rocks
- dotancohen 7y agoBut the oldest surface material is less than 2 million years old (Israel), and the second oldest surface is about half a million year old (Nevada). https://www.livescience.com/3542-oldest-surface-earth-discovered.html https://www.livescience.com/3542-oldest-surface-earth-discov...