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Nov 4, 2017 at 17:48 comment added Brythan This would be a better answer if it explained what the heavier than oxygen, nitrogen, and carbon dioxide gas was. As is this seems most like a water world. Stuff can float on water. People can't breathe water. But people can travel through water. Comet storm as an initial cause? The icy shell melts off, leaving a hard core to cause damage and water vapor to rain down and make groundwater.
Nov 4, 2017 at 13:15 review Low quality posts
Nov 4, 2017 at 17:48
Nov 4, 2017 at 5:54 review Late answers
Nov 4, 2017 at 8:17
Nov 4, 2017 at 5:44 review First posts
Nov 4, 2017 at 13:12
Nov 4, 2017 at 5:37 history answered r2dave2 CC BY-SA 3.0