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

Salt pans on sunny day, Badwater Basin, Death Valley National Park, Eastern California, California, 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

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

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

Scenic view of hoodoos and rock formations from Queens Garden Trail near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Rim Trail, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, 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

Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

Snow Canyon State Park, opened in 1962, location for films including Butch Cassidy and the Sundance Kid, near St. George, Utah, United States of America, North America

Lava lizard (Microlophus spp) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Abandoned former whaling station at Port Foster inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Polar Regions

Beautiful view of El Captain and Yosemite Valley during a summer sunrise, UNESCO World Heritage Site, California, United States of America, North America

A winter view looking out in Tjeldsundet strait towards the Saetertinden mountain in Troms County, Norway.

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Waves washing rock formation near coast of Porto Moniz and distant view of lighthouse on Ilheu Mole Island, Madeira, Portugal, Atlantic, Europe

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.

January 24, 2012 - Incandescent lava bombs expelled during a basaltic fissure eruption on Nyamuragira Volcano, Kimanura Eruption.

January 23, 2012 - Incandescent lava bombs expelled during a basaltic fissure eruption on Nyamuragira Volcano, Kimanura Eruption.

September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Sawmill Geyser, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.

January 22, 2011 - Lava Lake with small lava fountains, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Small fountains in lava lake, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Lava rafts floating on lava lake in summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

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

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

View over Carolafelsen Rocks to Schrammstein Mountains at sunset, Saxony Switzerland National Park, Saxony, Germany, Europe

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Red Canyon Arch, over the Utah State Highway 12 Scenic Byway between Panguitch and Bryce Canyon City, Utah, United States of America

A view of the west side of Angel de la Guarda Island, Baja California, Sea of Cortez, Mexico, North America

Bennett's Cross, an ancient granite monument, in winter snow, near Warren House, Dartmoor National Park, Devon, Great Britain.

Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico

The fire watchtower on the summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

The eastern summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Spectacular view of misty mountains from Hanpo Pass at Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

A tourist at Arco de Tajao during sunrise, El Poris de Abona, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America

A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads into Dead Wash at Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America

A detail of water flowing around rocks in the River Dart, at Dartmeet, Dartmoor National Park, Devon, England, United Kingdom, Europe

Pinto pony in enclosure of dry stone walls, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland

Woman walking at the bottom of a canyon with sandstone walls in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia