Title text:
Even geology papers about Heart Mountain are like, "Look, we all agree this 'volcanic gas earthquake hovercraft' thing seems like it can't possibly be right, but..."
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3162/
Well, this is in Montana, and until 1999, they were unique in the US in not really having highway speed limits.