Iceland or Mordor?

Our boss is currently stuck overseas in Europe (yeah, we feel for him) due to restless volcanic disruptions of Iceland's Mount Eyjafjallajökull. We're actually not sure when he'll be back, I mean take a look at the havoc caused by the eruption:

OK you got us, this is actually an image of Mount Doom from Lord of the Rings. But checking out the actual photo below, they sure look similar. Can you tell the difference? Check out these other images and put yourself to the test (via Buzzfeed):

Lets play a little game. Try to figure out which of the following are photos taken in Iceland this week, and which are pictures of Mordor from Lord of the Rings.