Orsolya Haarberg,Orsolya Haarberg / Rhiolite mountains. Landmannalaugar, Iceland. June 2008

Erlend Haarberg / Fumaroles at Hverir at night with northern lights in sky above, Namafjall, Iceland, February 2011

Erlend Haarberg / Steam vents at night, Hverirt, Namafjall, Iceland, February 2011

Erlend Haarberg / Steam vents at night with northern lights, Hverir, Namafjall, Iceland, February 2011

Erlend Haarberg / Blahver hot spring and Eyvindarhver fumarole, Hveravellir, Iceland, May 2010

Hanne & Jens Eriksen / Fumarole in the Krafla volcano area, Iceland, June 2009

Wild Wonders of Europe / Grunewald / Sulphuric gases coming out of a fumarole (solfatara) Vulcano, Aeolian Islands, Italy, May 2009

Orsolya Haarberg / Rhiolite mountains at Landmannalaugar. Rhyiolite volcanism. Iceland. June 2008

Orsolya Haarberg / Steam vent at Hverir. Námafjall, Iceland. June 2008

Jeff Foott / Fumaroles, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, Wyoming

Derek Galon / Steam rising from Boiling Lake, a sulphur lake surrounded by cloud forest on active volcano. Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Derek Galon / Steam rising from Boiling Lake, a sulphur lake on active volcano, surrounded by cloud forest. Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Derek Galon / Steam and gases rising from Boiling Lake, a water filled fumarole on active volcano, surrounded by cloud forest. Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Derek Galon / Aerial view of steam and gases rising from Boiling Lake, a water filled fumarole on active volcano. In cloud forest, Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Derek Galon / Steam and gases rising from Boiling Lake, a water filled fumarole on active volcano. Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Derek Galon / Steam and gases rising from Boiling Lake, a water filled fumarole on active volcano. Morne Trois Pitons National Park, Dominica, Lesser Antilles. 2020.

Tui De Roy / Alcedo giant tortoises (Chelonoidis vandenburghi) and volcanic landscape with fumeroles, Alcedo Volcano, Isabela Island, Galapagos.

Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi) and volcanic habitat with fumeroles, Alcedo Volcano, Isabela Island, Galapagos.

Ashley Cooper / Fumaroles emitting steam in the geothermal area of Hverir near Myvatn, northern Iceland, September 2010.

Franco Banfi / 'Boiling Lake', a flooded fumarole 10.5 km east of Roseau, Morne Trois Pitons National Park, UNESCO World Heritage Site, Dominica. February 2015.

Franco Banfi / People watching the 'Boiling Lake', a flooded fumarole 10.5 km east of Roseau, Morne Trois Pitons National Park, UNESCO World Heritage Site, Dominica. February 2015.

Claudio Contreras / Fumarole, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, Western Mexico, July

Claudio Contreras / Fumarole, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, Western Mexico, July

Claudio Contreras / Fumarole, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, Western Mexico, July

Claudio Contreras / Fumarole, Evermann Volcano, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, Western Mex...

Nick Upton / Fumarole field near the summit of Mount Teide volcano, with lava rock and pumic deposits stained yellow by sulphurous gas emissions, Tenerife, May.

Erlend Haarberg / Fumarole at sunrise at the Hverir, Iceland, July 2008

Erlend Haarberg / Steam vents at night, Hverir, Namafjall, Iceland, February 2011

Erlend Haarberg / Steam rising from the Eyvindarhver fumarole, Hveravellir, Iceland, May 2010

Erlend Haarberg / Eyvindarhver fumarole at sunrise, Hveravellir, Iceland, May 2010

Orsolya Haarberg / Fumarole on the side of Mountain Krafla, Iceland, June 2010

Orsolya Haarberg / Steam from fumarole on the side of Mountain Krafla, Iceland, June 2010

Orsolya Haarberg / Hot springs and fumarole, dawn, Hveravellir, Iceland, May 2010

Wild Wonders of Europe / Grunewald / Vent of a sulphurous fumarole (solfatara) Vulcano, Aeolian Islands, Italy, May 2009

Jouan & Rius / Fumaroles in the Krafla volcano area, Northern Iceland  2005

Orsolya Haarberg / Rhiolite mountains at Landmannalaugar. Rhyiolite volcanism. Iceland. June 2008

Orsolya Haarberg / Steam vent at Hverir. Námafjall, Iceland. June 2008

Jouan & Rius / Solfatara - fumarole that emits sulphurous gases, Rincon de la Vieja NP, Costa Rica

Pete Oxford / Valley of the geysers and fumaroles, Kamchatka peninsula, Russia Renee Bish

Pete Oxford / Valley of the geysers and fumaroles, Kamchatka peninsula, Russia

Cyril Ruoso / Steaming solfatare or fumarole, geothermal activity, Namafjall, Iceland

Cyril Ruoso / Steaming solfatare or fumarole, geothermic activity, Hveravellir, central Iceland

Jeff Foott / Fumarole, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, Wyoming

Daniel J. Cox / Steaming fumaroles, Castle Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming

Heike Odermatt / Steaming fumaroles in volcanic area, Kerlingarfjöll, Iceland

Heike Odermatt / Steaming fumaroles in volcanic area, Kerlingarfjöll, Iceland

Winfried Wisniewski / Solfatara in geothermal area, Hverir, Iceland

Kevin Schafer / Steam vents and fumaroles, Bumpass Hell, Lassen Volcanic National Park, California