fuming borehole, simmering and steaming volcanic vent in hverir, myvatn geothermal area in iceland

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