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

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

November 2007 - Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Orange coloration in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

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

January 21, 2011 - Nighttime view of summit caldera with lava lake, Nyiragongo Volcano, Democratic Republic Congo.

May 21, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

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

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

February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.

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

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.

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.

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

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

January 27, 2011 - Dallol geothermal area, terraces of 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.

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

Sunrise, buildings at Harbour Entrance, Kastellorizo (Megisti) Island, Dodecanese Group, Greek Islands, Greece, Europe

Reliefs, Tomb of Ramses V and VI, KV9, Valley of the Kings, UNESCO World Heritage Site, Luxor, Thebes, Egypt, North Africa, Africa

Reliefs of Deities and a Pharaoh on the right, Karnak Temple Complex, UNESCO World Heritage Site, Luxor, Thebes, Egypt, North Africa, Africa

Afternoon thunder shower, from Cape Royal Point, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Growing white and blue lavender (Lavandula), Sequim, Olympic Peninsula, Washington, United States of America, North America

Navajo Hogan House, Three Sisters in the background, Monument Valley Navajo Tribal Park, Utah, United States of America

Loop Drive, Three Sisters on left, Camel Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

Navajo Hogan House, Three Sisters in the background, Monument Valley Navajo Tribal Park, Utah, United States of America

North Window, Elephant Butte on left, Cly Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

View of Buttes from Artists Point, Monument Valley Navajo Tribal Park, Utah, United States of America

North Window, Elephant Butte on left, Cly Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

Early Morning Sunrise, West Mitten Butte, Monument Valley Navajo Tribal Park, Utah, United States of America

Evening Shadows, West Mitten Butte, Monument Valley Navajo Tribal Park, Utah, United States of America

John Ford's Point, Merrick Butte in background, Monument Valley Navajo Tribal Park, Utah, United States of America