Friday Photo (92): Working on Mount Etna Rosalie Tostevin August 16, 2013 Photos, Volcanoes Comments Closed GPS and leveling on Mt Etna with Dr John Murray from the Open University. Credit: Rick Wall (c) Geology for Global Development 2013 By Rosalie TostevinRosalie was the Himalayas Programme Officer for Geology for Global Development and writer for the GfGD blog. She is a geochemist and a postdoc at the University of Oxford.