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A recent Snowball Earth period might help. Heavy glaciation can cause enormous changes to the terrain. There are no longer any glaciers where I live, but there once were, during a recent ice age. ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:50Z (almost 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/61701 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/