#2058: Rock Wall
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Transcript
[Ponytail is gesturing towards Megan with her hand, while talking to her.]
Ponytail: I live next to a wall of rock 20 miles thick. There's no way around or over it. I'm trapped on this side forever.
Ponytail: I study the stuff on the other side.
[Caption below the frame:]
Mantle geology seems like the most frustrating field.
(Sourced from explainxkcd.com)
Title text:I don't trust mantle/core geologists because I suspect that, if they ever get a chance to peel away the Earth's crust, they'll do it in a heartbeat.