sulfuric smoker, volcanic vent in hverir, myvatn geothermal area in iceland

area boiling borehole crater crevasse field fissure formation fumarole fume fuming gas geology geothermal hissing hot spring hverarapara hverir iceland icelandic land landmark landscape mineral mountain mud myvatn natural nature orange pile red rock simmering smoke smoker soil solfataras steam stone sulfur sulfurous sulphating sulphur vent view volcanic water sulfuric steaming