sulfurous fumaroles in volcano mount sinabung

acid active aggressive berapi brimstone condensate crater danger environment eruption exploration fire foggy fracture fumarole fume fumy gas geophysics gunung heat hole indonesia landscape lifeless liquid mineral mountain nature nobody north power rock scenery scenic seismic sinabung smoke spitting steam stench stink stone sulfur sulfurous sumatera sumatra utara valley vapor vapour view volcanic volcano volcanology volcanon vulcano yellow