Title text:
It's ok if you want to close close your eyes for the slab graveyard, so you can still have fun riding the mantle plume back up afterward!
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3303/
Yes, there is a page on there about xkcd as a whole, though the Wikipedia page is more expansive in that case: https://en.wikipedia.org/wiki/Xkcd