[Damocles]

Originally Posted by 3DMaster

Not if an asteroid impact did the killing, leaving nothing but a crater and destroyed it all.

We see the crater and the spall. plus the outlying civilization remains or we become extinct. It would have to be a K-T event to obbliterate an Egyptian sized civilization's footprint.

Mines can collapse and disappear. Besides, perhaps they didn't have mines, not the way we do them.

The tailings don't.

Whatever catastrophe would have wiped out an advanced civillization would be devastating. More than enough to destroy cities - or submerge them. End of the Ice Age, water levels rose 120 meters, most cities of ours are near water; they'd all be under water, and probably most of it utterly destroyed. There are quite a few sites around the world under water that people have identified as artificial.

Ships.

Long gone; the little bits remaining we wouldn't recognise.

I recognize worked metal even if it is slagged. Something as big as the helicopter, I would recognize the castings-especially aluminum which is persistent in its worked state.

We didn't always use plastics and ceramics, no reason why they would have used them, or would have used destrcuctable ones. There's always the heat of lava and volcanic eruptions.

Unlikely that a volcanoe as big as Yosemite was active in Egypt(no caldera thirty miles across). They would use aluminum and worked glass and that would survive.(see above.)

Who says they made any? Ever consider the possiblity they were wiser than us, and looked for clean technology? Or perhaps they did pollute, but cleaned up as it started to become unbearable.

You smelt or refine you pollute. Period. That is chemistry.

PLENTY of them around, Atlantis the most famous.

TROY.

Nope, would have decayed and burned up in Earth's atmosphere a long time ago. And of course, that is assuming the even if there WERE satillites in orbit, NASA and the governments would have made it public.

I use a telescope and track satellites. Also geosynchromnous satellites have orbits that last 900,000 years plus and if you look up with a telescope in the night sky you see them.

Ah, yes, but those died and packed and were preserved in special conditions and didn't get wiped out by the first following desaster, stored hidden way under many, many, many layers of rock and ground...

Still dug up weren't they?

Kinda like there are thse many, many, many, many layers of Ice on Antartica. If the civilliastion was located there - we'd find nothing now, nothing at all, not until we burn through all that ice and burn around on the dirt of the continent itself

Ahem, We are digging up buried dinosaurs from under that ice sheet.(see antartica ice citation.)

Best wishes.