#2058: Rock Wall explain

[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.