[–] 23528076? 1 point -1 points 0 points (+0|-1) 8 months ago
Ancient plastic?
[–] 23525458? 1 point -1 points 0 points (+0|-1) 8 months ago
Plate tectonics? I learned about this at school, and wasn't sure where it applied until now.
[–] 23525646? 0 points 2 points 2 points (+2|-0) 8 months ago
This was sea ice that froze recently, as the article says.
[–] 23528076? 1 point -1 points 0 points (+0|-1) ago
Ancient plastic?