In case you haven’t stumbled across these already, share this photo set with your students as you discuss the volcanic eruption, how a volcano in northern Europe can ground planes around the world, weather patterns, etc.
http://www.boston.com/bigpicture/2010/04/icelands_disruptive_volcano.html
and more pictures: http://www.boston.com/bigpicture/2010/04/more_from_eyjafjallajokull.html
And here’s a cool Flickr image of the same volcano…