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May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan

December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 30, 2007 - Lava is flung high in the air during a nighttime eruption of Fuego volcano, Antigua, Guatemala.

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

November 2006 - Boulder rolling in lava flow at dusk during eruption of Mount Etna volcano, Sicily, Italy.

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.

One of Jeju Island's many lighthouses stands against Mount Sanbangsan and Mount Hallasan, a shield volcano, Jeju Island, South Korea, Asia

Angel Sculpture in front of the Nuestra Senora de los Remedios Church on top of the Great Pyramid with Popocatepetl Volcano in the background, Cholula, Puebla State, Mexico

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

The view of Teide volcano from La Ruleta viewpoint during sunrise, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist observes Teide volcano from La Ruleta viewpoint during sunrise, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist observes Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Looking down into Ubehebe crater, a Maar volcano, caused by groundwater contacting hot magma or lava, Death Valley National Park, California, United States of America, North America

Fontana del Gigante, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, Europe

The recent re-eruption of Mount Fagradalsfjall and Geldingadalir Volcano, Southwest Peninsula, Iceland, Polar Regions

Mount Vesuvius, a volcano located on the Bay of Naples about 9km from the city of Naples, Campania, Italy

Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico

Panoramic view of Sorrento, Mount Vesuvius and Bay of Naples, Sorrento, Campania, Italy, Mediterranean, Europe

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

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

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

Lava bombs erupt from multiple vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico

Arid soil on edge of the smoky Erta Ale volcano from above, Danakil Depression, Afar Region, Ethiopia, Africa

Smoke over the two craters of Erta Ale volcano summit caldera, Danakil Depression, Afar Region, Ethiopia, Africa

View of the cone of Gunung Api Wetar volcano from Nailaka island, Banda Islands, Maluku, Spice Islands, Indonesia, Southeast Asia, Asia

The Pura Bratan Hindau Shiva temple next to Catur volcano on the shore of Bratan Lake, Bali, Indonesia, Southeast Asia, Asia

View over the Banda archipelago from the summit of Gunung Api Wetar volcano, Banda Api, Maluku, Spice Islands, Indonesia, Southeast Asia, Asia

Panoramic aerial view of the active Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa

Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa

Aerial view of stone huts on top of majestic Erta Ale volcano, Danakil Depression, Afar Region, Ethiopia, Africa

Volcano Hummingbird (Selasphorus flammula), San Gerardo de Dota, San Jose Province, Costa Rica, Central America

Afar man looking down to Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa

Lava bombs erupt from multiple vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Lava bombs erupt from multiple vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

A person enjoy the beautiful landscape from the mouth of old volcano, Highlands, Iceland, Polar Regions

Lava bombs erupt from multiple vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Lava bombs erupt from one of many vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Lava bombs erupt from multiple vents on this volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Lava bombs erupt from multiple vents on volcano, active for at least 2000 years, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Parque Nacional de Timanfaya (Timanfaya National Park) with Montanas del Fuego, Yaiza, Lanzarote, Canary Islands, Spain

Mount Teide volcano at sunset, Mount Teide National Park, UNESCO World Heritage Site, Tenerife, Spain, Europe

Gros Piton, with palm trees and thatched sun umbrellas, Sugar Beach, St. Lucia, Windward Islands, West Indies Caribbean, Central America

Montana Arena cone at sunset, one of a chain of volcanoes south of Corralejo, Villaverde, Fuerteventura, Canary Islands, Spain, Europe

The Caldera de Gairia volcanic cone looms over this town in the central south, Tiscamanita, Fuerteventura, Canary Islands, Spain, Europe

Lobos Island, a nature reserve and La Caldera volcano, just north of this resort, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Mount Teide, the third active largest volcano in the world and the tallest mountain in Spain, UNESCO World Heritage Site, Teide, Tenerife, Canary Islands, Spain, Atlantic, Europe

Volcan Arenal in the middle of American continent, in an impressive landscape, Costa Rica, Central America

Active Concepcion Volcano seen from Merida in the island's Southeast, Merida, Volcan Maderas, Omotepe Island, Lake Nicaragua, Nicaragua, Central America

The 1610m Volcan Concepcion looms behind port of Moyogalpa in west of the island, Moyogalpa, Isla Omotepe, Lake Nicaragua, Nicaragua, Central America

The 1610m active Volcan Concepcion, greater of two volcanoes that form popular Omotepe Island (Isla Omotepe), Lake Nicaragua, Nicaragua, Central America

An Andean volcano rises above the Salar de Uyuni, the incredible salt desert, during a summer sunset, Oruro, Bolivia, South America

Cacti, Isla Incahuasi, a unique outcrop in the middle of the Salar de Uyuni, Oruro, Bolivia, South America

Volcano Tunupa on the horizon of the Salar de Uyuni, the biggest salt desert in the world, Oruro, Bolivia, South America

Gran Cratere and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

People looking at view of Stromboli island from Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Sulphur and fumaroles smoke on volcano Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

People walking through fumaroles on Volcano Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Gran Cratere (The Great Crater) and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Bathers enjoying the therapeutic benefits of the volcanic mud in the hot spring pool, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe