Fig. 2From: The iron-catalysed surface reactivity and health-pertinent physical characteristics of explosive volcanic ash from Mt. Etna, ItalyImages showing the eruption plumes formed (a) on 23 July 2001, dispersed to the SE of Etna (view from the summit area) and (b) on 2 November 2002, dispersed to the west of Etna (view from Catania). Photos by D. AndronicoBack to article page