the lava field of leirhnjukur

black bladder boil boiling bubble bubbling contrast contrasty cracked crater crust crystals dangerous drought eruption explosion field fumarole fumaroles gas geology geothermal geothermic ground gusher heat hole hot iceland krafla landmark landscape lava leirhnjukur magma minerals mud mudhole mudpot multicolored myvatn nature north odor outbreak panorama panoramic polar pool pot rhyolite rock smell soil solfataras solfatare spring steam stinking sulfur the thermal vapor vivid volcanic volcanism volcano water