The photo competition at the European Geosciences Union General Assembly 2011 had 275 entries, with 9 finalists. Participants at the General Assembly voted 1418 times and the top three images are below.
All the finalist and entry images are on Imaggeo,which is the online open access geosciences image repository of the European Geosciences Union. Every geoscientist who is an amateur photographer (but also other people) can submit their images to this repository. Being open access, it can be used by scientists for their presentations or publications as well as by the press. If you submit your images to imaggeo, you retain full rights of use, since they are licenced and distributed by EGU under a Creative Commons licence.
1st Place: James Levine

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.