I wonder...

[davywavy]

...if the entire human race were to drop dead tomorrow of Bird Flu, how long it would be before there were no visible signs that we'd ever existed?

Comments

[karohemd.livejournal.com]

There are still man-made structures from the stone age visible today and considering the longevity of modern structures you mention (not to mention the amount and size, a city like London will be a lot more difficult to obscure than a small iron age settlement), it will take far longer if the human population just died.
It'd have to be worldwide catastrophic event (volcanic eruptions everywhere, a meteor the size of the moon smashing into Earth etc.) to obscure everything.

[davywavy.livejournal.com]

I'm really thinking of everyone keeping over dead, and how long the ravages of time would take to remove us if that happened?

[karohemd.livejournal.com]

A lot longer than 10,000 years. Several 100K? A Million? I don't know. There's so much stuff built on the surface, it'll take very long indeed.