Norway has two active volcanoes. One is the northernmost subaerial volcano in the world, Beerenberg on the island of Jan Mayen. The other is at the bottom of the ocean, spewing out mud and methane.
The magnificent images of a crater on Yamal Peninsula, caused by collapsing permafrost, have become world famous. But did you know that this permafrost extends to the ocean floor? And it is thawing.