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Mount Mayon Volcano, Legazpi, south east Luzon, Philippines, Southeast Asia, Asia
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Devil's Thumb, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North  America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tripitos Arch, Paxos, Paxi, Ionian Islands, Greek Islands, Greece, Europe
Bodmin Moor, Cornwall, England, United Kingdom, Europe
Nash Point, Glamorgan Heritage Coast, Wales, United Kingdom, Europe
Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Sulphur encrusted fumarole at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Fumaroles on collapsed side of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Morning Glory Pool and surrounds, 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
Tourists ascending Sigiriya (Lion Rock), UNESCO World Heritage Site, Sri Lanka, Asia
Sawmill Geyser erupts, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Cold tourists on seat surrounded by steam, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Dead trees and steam with mountain backdrop and blue skies, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hillside terraces countryside landscape, near Huebro, Ruta del Agua, Sierra Alhamilla mountains, Nijar, Almeria, Andalusia, Spain, Europe
Yachts, swimmers and granite rocks, The Baths, Virgin Gorda, British Virgin Islands (BVI), West Indies, Caribbean, Central America
Fallen lodgepole pines, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Fishing Cone Geyser with freezing mists, Yellowstone Lake at West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Visitors, steam and vivid colours, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Glowing active volcanic crater of Volcan Telica on a starry night, with the Milky Way, Orion and the Pleiades, Leon, Nicaragua, Central America
Glowing active 700m wide volcanic crater of Volcan Telica with lava vents far below, in the North West volcanic chain, Leon, Nicaragua, Central America
Laguna Cejar (floating salt lake lagoon), Atacama Desert, North Chile, Chile, South America
Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America
Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Gunnuhver Hot Spring, Reykjanes Peninsula, Iceland, Polar Regions
Mud Volcano Area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Seltun, Krysuvik geothermal area, Reykjanes Peninsula, Iceland, Polar Regions
Rock and Spindle on the Fife Coast near St, Andrews, Fife, Scotland, United Kingdom, Europe
Sea stacks at sunset, Cannon Beach, Oregon, United States of America, North America
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Visitor at Painted Wall View Point, Gunnison River deep in the canyon, Black Canyon of the Gunnison National Park, Colorado, United States of America, North America
Gunnison River deep in the canyon from Kneeling Camel View Point, Black Canyon of the Gunnison National Park, Colorado, United States of America, North America
Anti Atlas mountains between Tata and Tafraoute, Morocco, North Africa, Africa
Desert Varnish on rocks, The Gorge, Capitol Reef National Park, Utah, United States of America, North America
Wadi Dana, Dana Nature Reserve, Jordan, Middle East
Tourists waiting to watch the full moon rise over the Valle de la Luna (Valley of the Moon), Atacama Desert, Norte Grande, Chile, South America
Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Hot air balloon over the phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Freshwater Bay and Tennyson Down from Afton Down, Isle of Wight, England, United Kingdom, Europe
The Wain Stones (Kissing Stones) on Bleaklow Moor, on the Pennine Way footpath, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Old Goris, Goris, Armenia, Central Asia, Asia
Preseli Hills (Mynyddoedd Y Preseli), source of Stonehenge bluestone megaliths, Pembrokeshire, Wales, United Kingdom, Europe
Snow-capped peaks and glaciers in Icy Arm, Baffin Island, Nunavut, Canada, North America
Fog lifting on the steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Snow-capped peaks and glaciers in Icy Arm, Baffin Island, Nunavut, Canada, North America
Fog lifting on the steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Reflections on a calm sea of the steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America
Ice skating, Maloe More (Little Sea), frozen lake during winter, Olkhon island, Lake Baikal, UNESCO World Heritage Site, Irkutsk Oblast, Siberia, Russia, Eurasia
Fishing on the ice, Maloe More (Little Sea), frozen lake during winter, Olkhon island, Lake Baikal, UNESCO World Heritage Site, Irkutsk Oblast, Siberia, Russia, Eurasia
The great geyser Geysir, now dormant (2008), with the more active Strokkur geyser erupting in the distance, Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions
Geothermal activity of mudpots, geysers, and hot springs, at Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
Mudpots at Namaskard geothermal area (Namafjall-Hverarond), near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions
Limestone pinnacles in Shilin, Stone Forest, at Lunan, Yunnan, China, Asia
Natural arch, Spitskoppe mountains, Damaraland, Namibia, Africa
Cold lava after an eruption of Tolbachik volcano, Kamchatka, Russia, Eurasia
Active lava eruption on the Tolbachik volcano, Kamchatka, Russia, Eurasia
Active lava eruption on the Tolbachik volcano, Kamchatka, Russia, Eurasia
Active lava stream, Tolbachik volcano, Kamchatka, Russia, Eurasia
Active lava stream, Tolbachik volcano, Kamchatka, Russia, Eurasia
Trekking, Pinatubo volcano, Luzon, Philippines, Southeast Asia, Asia
Pinatubo volcano, Luzon, Philippines, Southeast Asia, Asia
Tufa towers in Mono Lake at twilight, California, United States of America, North America
Tufa towers in Mono Lake at twilight, California, United States of America, North America
Sunset over a tranquil Mono Lake in autumn California, United States of America, North America
Mono Lake tufa towers at sunset in autumn, California, United States of America, North America
The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
Echidna Chasm Walk, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Range, Western Australia, Australia, Pacific
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Gritstone rock formations amongst the heather clad moors of Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Fosso Sinkhole on summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
The Old Man of Storr, overlooking Loch Leathan and Raasay Sound, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
The Old Man of Storr, a rock formation on the edge of the Trotternish Ridge, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe
Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe
Deserted beach with Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
Mount Lidgbird and Mount Gower at sunset, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
View of pier with Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand
Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific
An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific