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Mount Solitary and Jamison Valley, Blue Mountains, Blue Mountains National Park, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Yellow and orange aspens reflected in Sliver Lake in the fall, Wasatch-Cache National Forest, Utah, United States of America, North America

Rocks at the Egg Factory at dusk, Bisti Wilderness, New Mexico, United States of America, North America

The island of Spargi, Maddalena Islands, La Maddalena National Park, Sardinia, Italy, Mediterranean, Europe

Yellow and orange aspens in the fall, Wasatch Mountain State Park, Utah, United States of America, North America

Sandstone domes and clouds, Capitol Reef National Park, Utah, United States of America, North America

December 22, 2007 - Lava flowing from a small lava shield on the flank of Pacaya volcano, Guatemala.

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

February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, 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 of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Hoodoo filled cliffs on the north side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Vew from Aconcagua 6962m, highest peak in South America, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Climber ice climbing on glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Horseshoe Falls, Mount Field National Park, UNESCO World Heritage Site, Tasmania, Australia, Pacific

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.

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

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.

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 - Powerful 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.

January 24, 2012 - Yellow sulphurous deposits resulting from degassing coating scoria cone formed during eruption on Nyamuragira Volcano, Democratic Republic of Congo.

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

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

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.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, 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.

A bird's eye view of an idyllic island and healthy fringing reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Makhtesh Ramon is a geological landform,commonly known as 'crater' but more accurately described as erosion cirque,Negev,Israel,Middle East,Western Asia

Makhtesh Ramon is a geological landform,commonly known as 'crater' but more accurately described as erosion cirque,Negev,Israel,Middle East,Western Asia

Sand dunes in desert at sunset, Huacachina, Ica District, Ica Province, Ica Region, Peru, South America

Prambanan Temple Compounds, UNESCO World Heritage Site, region of Yogyakarta, Java island, Indonesia, Southeast Asia, Asia

October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.

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.

October 15, 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 24, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia, seen in evening light. Ash cloud is produced by the activity. Kamen volcano is seen on right.

October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

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.

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

October 21, 2013 - Nighttime moonlit view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

February 24, 2013 - Powerful explosive eruption of Sakurajima volcano, Japan. Ash cloud rises against blue sky.

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (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. 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.

November 30, 2012 - Glowing Rerombola lava dome with incandescent rockfall deposit, Paluweh volcano, Flores, Indonesia.