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[–] 23528076? 1 point -1 points (+0|-1) ago 

Ancient plastic?

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[–] 23525458? 1 point -1 points (+0|-1) ago 

Plate tectonics? I learned about this at school, and wasn't sure where it applied until now.

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[–] 23525646? 0 points 2 points (+2|-0) ago 

This was sea ice that froze recently, as the article says.