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Wahban Crater (caldera) in Hejaz Mountains northeast of Jeddah, Saudi Arabia, Middle East
Tilted layers showing bedding planes in strata of sedimentary rock in coastal cliff at Odeceixe, Algarve, Portugal, Europe
Curved concave reflector panels desalinisation plant at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe
Grape vines growing in black volcanic soil in protected enclosed pits, La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Lone Pine Tree, Coconino National Forest, Arizona, USA
Astronaut and earth display in museum, Lyndon B. Johnson Space Center, Houston, Texas, United States of America, North America
Views of the Chilean research base Presidente Eduardo Frei Montalva, Antarctica, Southern Ocean, Polar Regions
Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia
Aerial of Pia glacier, Tierra del Fuego, Chile, South America
Igneous sill forms a rocky backdrop to Duntulm and on the beach Jurassic sedimentary rocks yield fossils & dinosaur footprints at this SSSI locality. Duntulm, North West Trotternish, Skye, Inner Hebrides, Skye, Scotland, United Kingdom, Europe
Aerial of a little ship floating between the ice below the Eqi glacier, Western Greenland, Denmark, Polar Regions
Aerial of Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America
Hikers inside the caldera Enclos Fouque, Piton de la Fournaise, Reunion
Small crater of Formica Leo volcano in caldera Enclos Fouque near Piton de la Fournaise, Reunion
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Views of Base Presidente Eduardo Frei Montalva, Antarctica, Southern Ocean, Polar Regions
The southeast summit of O'Leary Peak, Coconino National Forest, Arizona, USA
Tourists exploring colorful rocks at Artist's Palette, Death Valley National Park, Eastern California, California, United States of America, North America
Double Arch in the Windows Section, Arches National Park, Moab, Utah, United States of America, North America
Fossil Colonial Coral, Carboniferous Limestone, The Burren, County Clare, Ireland,
Hoodoo known as The Hunter at Agua Canyon, Bryce Canyon National Park, Utah, USA
Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America
Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America
Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The cliff wall of the Keyhole Sink in the Kaibab National Forest near Williams, Arizona, USA
O'Leary Peak, Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Popocatepetl Volcano seen from Cholula, Puebla State, Mexico
Petrified Waterfall at sunset, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Panorama of a rain storm over the North Rim of Grand Canyon National Park, Arizona, USA
Isolated Limestone Stack and Windswept Vegetation Overlooking Rough Sea at Pancake Rocks, Punakaiki, New Zealand
A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America
Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America
O'Leary Peak, Coconino National Forest, Arizona, USA
Sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia
Sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia
Poas volcano, Poas National Park, Costa Rica, Central America
Wide Panoramic view of The Bjarnarhofn Lava Field, Snaefellsnes Peninsula, Iceland
Petrified forest, Agia Marina, Agios Nikolaos Geopark geological structures, Greece
The spectacular scenery on the island of Madeira, Atlantic Ocean, Portugal
The Southern Patagonian Icesheet, one of the world's largest ice-caps, along the western edge of the Chalten Massif, Patagonia, Argentina
Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico
View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA
View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA
View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA
Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA
The giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA
A water leak from a crack in Stone Dam in the Kaibab National Forest, Arizona, USA
People at the Viewpoint on the Harrat volcanic plateau, AlUla, Medina Province, Saudi Arabia
Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia
Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands
View of the famous rock runs outside Stanley, the capital and only city in the Falkland Islands
Twin Erratic boulders high above Nant Ffrancon valley, Snowdonia National Park (Eryri), North Wales, United Kingdom
Gorner Glacier on Monte Rosa massif, Zermatt, Canton Valais, Switzerland
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Tousside volcano above Trou du Natron, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the rocky mountains around Zouar, Tibesti Mountains, Chad
Aerial of the rocky mountains around Zouar, Tibesti Mountains, Chad
Adult brown bears (Ursus arctos) courtship behaviour, Brooks River, Katmai National Park near Bristol Bay, Alaska, United States of America
Volcanic scenery in the valley of Alto Mira, northwest Saint Anthony, Cape Verde
Volcanic scenery in the valley of Alto Mira, northwest Saint Anthony, Cape Verde
Volcanic scenery in the valley of Alto Mira, northwest Saint Anthony, Cape Verde
Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico
Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland
Volcanic cinder rim in Coconino National Forest, Arizona, USA
Dry waterfall cliffs, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America
Dry waterfall cliffs, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America
A view of the boiling mud at Namafjall, Iceland
The Natural Bridge Arch at Bryce Canyon National Park, Utah, USA
Tabular icebergs in and around the Weddell Sea during the summer months, Antarctica, Southern Ocean, Polar Regions
Dramatic mountain landscape and geological fault in the Italian Alps, Colle del Turlo, Vercelli, Piedmont, Italy, Europe
Aerial of the Eqi glacier, Western Greenland, Denmark, Polar Regions
Unique Coastal Rock Platform with Tide Pool and Fossil-Like Textures on Ward Beach, Marlborough, New Zealand
Waiotapu Thermal Wonderland, North Island, New Zealand. Views of steaming craters on the Waiotapu Thermal Track, New Zealand
King Leopold sandstone formation known as Thor's Hammer, Hunter River, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific
Healer with medicinal herbs in Ngiresi village, Tanzania
Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland
Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland
Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland
Adult Subantarctic Skua (Catharacta antarctica lonnbergi) on tussac at Salisbury Plain on South Georgia Island, Polar Regions
Aerial of Potter glacier, Tierra del Fuego, Chile, South America
The Negribreen (Negri Glacier), in Olav V Land on the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe
Aerial of Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America
Aerial of Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America
Dunes harbour, Devon island, Nunavut, Canadian Arctic, Canada, North America
Aerial of an ice arch in the Nuuk Icefjord, Western Greenland, Denmark, Polar Regions
Fairy chimney rock formations, Pasabag Valley, Cavusin, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Views of the eastern side of the Antarctic Peninsula in the Weddell Sea, Antarctica, Polar Regions