Vulcanologist at work, La Fournaise volcano, island of Reunion, Africa

africa african crater danger day daytime energy erupt erupting eruption estimating extreme terrain fire flame fournaise geology heat hot indian ocean jeopardy la fournaise lava male man measure measuring molten lava mountain natural world nature one man only outdoors outside people person physical geography power protection protective workwear reunion rock security simmering surface processes toiling topography travel travel destinations volatility volcano volcanoes vulcanologist vulcanology work working peak safety stone volcanic