20 Things That Would Happen if Humans Disappeared From Earth Overnight
| September 14, 2016
Dams and delta cities will eventually crumble
Two hundred years after humans leave earth, water pressure will break down manmade structures like the Hoover Dam, which will finally collapse, flooding the land and forever changing the landscape. The Colorado River will once again reach the Gulf of Mexico as it did centuries ago. Cities built on bodies of water will eventually be swept away into the ocean.
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