Friday Photo (91): Lava Flows at Mount Etna Rosalie Tostevin August 9, 2013 Photos, Volcanoes Comments Closed Hiking across lava flows on Mt Etna to use a GPS point on the cone in the background. 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.