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El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Lighthouse on Mannu Cape wild coast of Sardinia, aerial drone view at sunset, Sardinia, Italy, Mediterranean, Europe

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) sneezing excess salt from its nostrils in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

The cliffs of Devon's Atlantic coast, at Hartland Quay, seen during a calm evening sunset, Devon, England, United Kingdom, Europe

Coastline and recovery place of the Chinchorro Mummies, UNESCO World Heritage Site, Camarones Valley, northern Atacama desert, Chile, South America

Natural rock formations with Manly Beacon at Zabriskie Point at dusk, Death Valley National Park, Eastern California, California, United States of America, North America

Watchman mountain, Watchman trail, Zion National Park, Utah, United States of America, North America

Bryce Canyon amphitheater at sunset, Bryce Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos in Bryce Canyon amphitheater at sunrise, Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Rock formations near Skyline Arch, Arches National Park, Moab, Utah, United States of America, North America

Rock formations near Skyline Arch, Arches National Park, Moab, Utah, United States of America, North America

Abstract details of orange slot canyon wall, Antelope Canyon X, Page, Arizona, United States of America, North America

Grand Canyon, Desert View Viewpoint, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bend of Colorado River at Dead Horse Point at sunrise, Dead Horse Point State Park, Utah, United States of America, North America

Rock formation of Spearhead Mesa at Artist's Point, Monument Valley, Arizona, United States of America, North America

Abstract details of orange slot canyon walls, Antelope Canyon X, Page, Arizona, United States of America, North America

Abstract details of orange slot canyon wall, Antelope Canyon X, Page, Arizona, United States of America, North America

Grand Canyon, Lipan Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Lipan Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Duck on a rock viewpoint, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, from Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Hopi Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, from Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Mohave Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Monument Creek Vista, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon at sunset, Yaki Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Details of the rock formation at Zabriskie Point, Death Valley, California, United States of America, North America

Warm light of the sunrise envelop the sand dunes at Mesquite Flat, Death Valley, California, United States of America, North America

Portland Bill at sunset, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial drone panoramic view of Fort of Nossa Senhora da Rocha (Fort of Our Lady of the Rock) (Castle of Porches), Porches, Lagoa, Algarve, Portugal

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 16, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

November 30, 2012 - Glowing Rerombola lava dome of Paluweh (or Rokatenda) volcano during eruption in 2012, Flores, Indonesia.

November 28, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible against blue night sky.

November 27, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.

May 21, 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 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

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

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

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

Billings Gap Overlook on Blue Mesa towards sunset, Petrified Forest National Park, Arizona, United States of America, North America

Folded sedimentary rocks in cliffs at Welcombe Mouth, on the Atlantic coast; Hartland, north Devon, England, United Kingdom, Europe

Natural cave formation on a rocky hill with green plantation stretching to the sea, Zakynthos, Ionian Islands, Greek Islands, Greece, Europe

Hikers amongst hoodoo formations on the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Hikers amongst hoodoo formations on the Sunrise Point Trail in Bryce Canyon National Park, Utah, United States of America, North America

View of hoodoo formations from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Mitchell River waterfalls via helicopter from Swift Bay, Kimberley, Western Australia, Australia, Pacific

King Leopold sandstone formation known as Thor's Hammer, Hunter River, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific

Mitchell River waterfalls via helicopter from Swift Bay, Kimberley, Western Australia, Australia, Pacific

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Valley in the Andes, near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America

Valle Rojo (Red Valley) at sunrise, near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America

Golden evening light on the limestone cliffs, Dunraven Bay, Southerndown, Vale of Glamorgan, Wales, United Kingdom

Young woman by the torrent, Riva Valley (Val di Riva) (Reintal), near Ahrntal (Valle Aurina), South Tyrol (Alto Adige), Italy

An island of rock in an unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

Casner Canyon in Wet Beaver Creek Wilderness viewed from White Mesa summit, in Coconino National Forest, Arizona, United States of America