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Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, the flow threatened the town of Nicolosi below, Mt Etna, Sicily, Italy

Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, This flow threatened the town of Nicolosi, Sicily, Italy

Ruins of Pompeii, destroyed in volcanic eruption of AD 79, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Cliff Geyser erupts from geyserite bank on edge of Firehole River through Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Church belfry ruins and volcanic cone with smoke plume of Mount Mayon, 2462m, Cagsawa, where 1200 people were buried alive in 1814 eruption, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia

Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe

Crateri Silvestri, high angle view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

View of lava fields and snow-capped peaks in the distance, Etna, Sicily, Italy, Mediterranean, Europe

Starry night sky over a volcanic landscape with a colorful twilight gradient in Tenerife, Canary Islands, Spain, Atlantic, Europe

Farm buildings and green fields with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Tourists watch the eruption of the Strokkur geyser, Haukadalur valley, Hvita River, Iceland, Polar Regions

Mount Vesuvius seen from the ruins of Pompeii, buried in the ash flow of the eruption of AD 79, Columbus basalt lava marble and brick, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Pohutu geyser erupting steaming water from sulphurous mud and rock in Te Puia, Whakarewarewa Thermal Reserve in geothermal valley, Rotorua, North Island, New Zealand, Pacific

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

Mount Etna Volcano, old lava flow from an eruption, UNESCO World Heritage Site, Sicily, Italy, Europe

Landscape covered in volcanic ash and dust with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Tourists visiting an old lava flow from an eruption on Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Europe

Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe

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

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

Griggs volcano overlooks Valley of Ten Thousand Smokes filled by ash in 1912 eruption of Katmai, Katmai Volcano National Park, Alaska, USA, North America

Mount Bromo volcano erupting at sunrise, sending volcanic ash high into the sky, East Java, Indonesia, Southeast Asia, Asia

Valley of Ten Thousand Smokes with ignimbrite of 1912 eruption, Griggs volcano behind, Katmai National Park, Alaska, USA, North America

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

Tourists standing at a cold lava stream after an eruption of Tolbachik volcano, Kamchatka, Russia, Eurasia

Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe

Distant view towards mountains with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

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

Eyjafjallajokull eruption showing billowing ash plume and rocks exploding into the sky of southern Iceland, Iceland, Polar Regions

Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe

Tourists standing at a cold lava stream after an eruption of Tolbachik volcano, Kamchatka, Russia, Eurasia

Lake in summit crater formed in 1991 eruption, Pinatubo volcano, northern Luzon, Philippines, Southeast Asia, Asia

Grand Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Castle Geyser with rainbow in the spray, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Minor eruption from Steamboat Geyser, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Strokkur (the Churn) which spouts up to 35 meters erupting every 10 minutes, Geysir, Golden Circle, Iceland, Polar Regions

Strokkur (the Churn) which spouts up to 35 meters erupting every 10 minutes, Geysir, Golden Circle, Iceland, Polar Regions

Mount Vesuvius behind the ruins of the Roman resort of Herculaneum, destroyed in the eruption of AD 79 which covered the town in lava and mud, Herculaneum, near Naples, Campania, Italy, Europe

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

Lava and ash floes in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Pompeii, UNESCO World Heritage Site, archaeological site of ancient city destroyed by Mount Vesuvius volcanic eruption, near Naples,Campania, Italy, Europe

Casa dell'Atrio Corinzio (ouse of the Corinthian Atrium), archaeological site of Herculaneum, UNESCO World Heritage Site, province of Naples, Campania region, Italy, Europe

Headland with lighthouse at Dyrholaey looking towards a black volcanic sand beach stretching 15 miles into the distance and the ash plume of the Eyjafjallajokull eruption, near Vik i Myrdal, southern area, Iceland, Polar Regions

Oil gusher reconstruction, Spindletop boomtown period, Spindletop-Gladys City Boomtown Museum, Beaumont, Texas, United States of America

Via Stabiana, archaeological site of Pompeii, UNESCO World Heritage Site, province of Naples, Campania, Italy, Europe

Stepping stones above perpetually flowing water needed to cross streets and keep the way clear for carts, archaeological site of Pompeii, UNESCO World Heritage Site, province of Naples, Campania, Italy, Europe

Amphitheatre of the archaeological site of Pompeii, UNESCO World Heritage Site, province of Naples, Campania region, Italy, Europe

Archaeological site of Pompeii, UNESCO World Heritage Site, province of Naples, Campania region, Italy, Europe

View of the archaeological site of Herculaneum, UNESCO World Heritage Site, province of Naples, Campania region, Italy, Europe

Fagradalsfjall volcano, active vent during the eruption of July 2021, Reykjanes Peninsula, Iceland, Polar Regions