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Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupts, forcing steam high into the air, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rocket and Grotto cone geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone observer watches Grand Geyser erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupts, forcing steam high into the air, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone Star Geyser erupts and creates rainbow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupts and steam blocks the sun, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser and steamy surrounds, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mount Etna in 2001, the Piano del Lago cone destroyed the Sapienza cable car, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia

Eruptions at the Monti Calcarazzi fissure and the Piano del Lago cone on Mount Etna, that threatened tourist facilities and village in 2001, Sicily, Italy, Europe

Lava flow from the Piano del Lago cone destroying the cable car above Rifugio Sapienza on the south flank of Mount Etna during the 2001 eruptions, Sicily, Italy, Europe

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Erupting geysers and mineral terraces, Whakarewarewa thermal area, Rotorua, South Auckland, North Island, New Zealand, Pacific

Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Lava flow from the Monti Calcarazzi fissure on the southern flank of Mount Etna in 2001, threatening the town of Nicolosi below, Sicily, Italy, Europe

Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View across bay south of Taormina to the east coast resort of Giardina-Naxos, and Mount Etna erupting in distance, island of Sicily, Italy, Mediterranean, Europe

Eruptions at the Monti Caltarazzo fissure and the Piano del Lago cone on Mount Etna, Sicily, Italy, Europe

Illustration from Francois Valentijn's 18th century Oud Nieuw Oost-Indien showing the Island of Ternate, Moluccas Indonesia, Southeast Asia, Asia

Echinus Geyser, erupts every hour in Norris Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Crowds of spectators watching Old Faithful Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Thermal pools at Geysir with Strokkur geyser erupting in the background, Geysir, southwest area, Iceland, Polar Regions

Pseudocraters at Kirkjubaejarklauster, formed by lava erupting onto a wet surface causing explosions of steam, Iceland, Polar Regions

Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland

Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland

Lava erupting in Halemaumau Crater, Hawaii Volcanoes National Park, Island of Hawaii. December 10, 2016

Lava fountaining and pahoehoe flow during a Pu'u O'o rift eruption in Hawaii Volcanoes National Park on the Big Island of Hawaii.

Red hot lava and sparks erupting from the Tavurvur Volcano at night, Rabaul, East New Britain, Papua New Guinea, Pacific

Red hot lava and sparks erupting from the Tavurvur volcano at night, Rabaul, East New Britain, Papua New Guinea, Melanesia- Pacific

Eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

View from M√Ωrdalsjoekull Glacier towards the volcanic ash cloud from the eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

Evacuation from the glacier, eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

Tourists watching steam and a water spout, Strokkur geyser, backlit, Haukadalur valley, Golden Circle, Su√∞urland, Sudurland, southern Iceland, Iceland, Europe

People with Super-Jeeps observing the lava flow from the eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

View from M√Ωrdalsjoekull Glacier towards the volcanic ash cloud from the eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

People watching Strokkur Geyser errupting, fountain, hot springs, Haukadalur, Golden Circle, Iceland, Scandinavia, Northern Europe, Europe

People and super jeeps at a lookout point during the eruption of the volcano Fimmvoer√∞uh√°ls, Fimmvoerduhals, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highlands, Iceland, Europe

Cloud of ash from Eyjafjallajoekull volcano and a steam plume from the lava flow in Gigjoekull glacier tongue, Iceland, Europe

Tourists on bridge, view of erupting Pohutu Geyser with rainbow, Te Puia, Whakarewarewa, Rotorua, Bay of Plenty, New Zealand, Oceania

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Erupting Pohutu Geyser with rainbow, sinter terraces, Te Puia, Whakarewarewa, Rotorua, Bay of Plenty, New Zealand, Oceania

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Ash cloud of the Eyjafjallajoekull volcano, steam plume from the lava flow in Gigjoekull glacier tongue, and exit point of the previous flood, Gigjoekull, Iceland, Europe

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Eyjafjallajoekull volcano, the ash cloud mirroring in a small lake, ï¬orsmoerk, Thorsmoerk mountain ridge, Iceland, Europe

Eruption of the Fimmvoer√∞uh√°ls Volcano, between M√Ωrdalsjoekull and Eyjafjallajoekull, Highland, Iceland, Europe

Iceland horses in front of the ash cloud of the Eyjafjallajoekull volcano, Landeyjar, South Iceland, Iceland, Europe

Aerial view, erupting volcano with lava fountains and lava field, crater with erupting lava and lava flow, Fagradalsfjall, Reykjanes Peninsula, Iceland, Europe

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Tourists watching the eruption of the Daisy Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA