Title text:
Mantle plumes explain Hawaii, Yellowstone, Iceland, the East African Rift, the Adirondack uplift, the Permian extinction, the decline of Rome, the DB Cooper hijacking, and the balrog in Moria. Those little hills of sand in your yard are caused by antle plumes.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3141/
I... I don't understand what the joke is here. Not even the explainxkcd mentions any kind of humor outside of the alt text. What am I missing?
It’s implying that every time we don’t know why there’s land somewhere we don’t expect geologists are just like “uhhhh mantle plume”
The alt text is the joke this time