by James Levine, British Antarctic Survey, Cambridge, UK

Geysir (from which the English word, geyser, is derived) in the Haukadalur valley, Iceland. The photograph was taken just before the geyser 'blew'; you can see the air bubbles rushing towards the surface within the mounting dome of water.

Featured on GeoLog, the official blog of the European Geosciences Union

Winner in the EGU Photo Competition 2011