"Divers of the Prefectura Naval Argentina inspect the Rio Limay, covered with pumice and ash from Chile’s Puyehue-Cordon Caulle volcano chain at the mountain resort of San Carlos de Bariloche in Argentina, on June 16, 2011." Chiwi Giambirtone.
Mount Bromo, Indonesia. Michel Melsen.
Name that volcano! (No, seriously, which one is this?)
UPDATE: Tungurahua in Ecuador.
Ash erupted from Mount Etna, a volcano near Catania, Italy, Thursday, Jan. 5, 2012.
[Credit : Davide Caudullo/European Pressphoto Agency]