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There has to be some sort of heat source for this to happen, and it can't be something temporary. Here are some ideas: Volcanic Activity. Vodolaz095 beat me to posting this, but I was already wor...
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#1: Attribution notice removed
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System
·
2020-06-01T14:13:41Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/5253 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/