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June 2006 - Ejection of lava during nighttime Strombolian eruption of Stromboli volcano, Aeolian Islands, Mediterranian Sea, Italy.

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

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

November 2006 - Boulder rolling in lava flow at dusk during eruption of Mount Etna volcano, Sicily, Italy.

Interesting lenticular cloud formations forming over the island of South Georgia in the Southern Ocean

Ardvreck Castle and Stac Pollaidh, Loch Assynt, Ross and Cromarty, Highlands, Scotland, United Kingdom

Flute player pictograph, Honanki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

Valley next to Rainbow Mountain, Uchullujllo, Pitumarca District, Canchis Province, Cuzco Region, Peru, South America

View of Navajo sandstone formations from Angel's Landing Trail in Zion National Park, Utah, United States of America, North 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

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

Val Marzon viewed from path connecting refuges Auronzo and Lavaredo, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Three hikers at foot of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

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

The boundary fence on the east side of 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

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

Limestone cliffs and beach, Dunraven Bay, Southerndown, Vale of Glamorgan, South Wales, United Kingdom

Bighorn sheep petroglyph, Petrified Forest National Park, Arizona, United States of America, North America

Wakan village in the Western Hajar Mountains, border South Batinah and Al Dakhiliyah Governorates, Sultanate of Oman, Arabian Peninsula

Wakan village, Western Hajar Mountains, border South Batinah Governorate and Al Dakhiliyah Governorates, Sultanate of Oman, Arabian Peninsula

Cliffs viewed from Dun Aengus, prehistoric hill fort, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland

Hamlet near Aeer Arann Air field on the east end of Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland

People using binoculars to see rock cut tombs in cliffs at Dadan, ancient capital of Dadan And Lihyan kingdoms, AlUla, Medina Province, Saudi Arabia

Acrocorinth historic castle on top of the mountain at sunset with Euphorbia characias (Mediterranean spurge) yellow flowers, Greece

Safari tour among the magnificent sandstone rock structures in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

Woman admiring ancient symbols and rock carvings on sandstone rock cliff in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Aerial of tombs carved in sandstone rock of Jabal Banat (Qasr al-Bint), Hegra (Madain Salih), UNESCO, AlUla area, Medina Province, Saudi Arabia

Aerial of the Pont d'Arc, Ardeche Gorge (Gorges de l'Ardeche), Ardeche, Auvergne-Rhone-Alpes, France, Europe

Tombs carved into sandstone rock of Jabal Banat (Qasr Al-Bint) area in site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Woman in a niqab at Face Rock, a sandstone rock formation in shape of human head profile, Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Tombs carved into the sandstone rock of Jabal Banat (Qasr al-Bint) area within site of Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Rocky part of the coast at Tsarabanjina island, Mitsio archipelago, Republic of Madagascar, Indian Ocean

Rocky part of the coast at Tsarabanjina island, Mitsio archipelago, Republic of Madagascar, Indian Ocean

Golden evening light on the cliffs in winter at Dunraven Bay, Southerndown, Bridgend, South Wales, United Kingdom

Golden evening light on the cliffs in winter at Dunraven Bay, Southerndown, Bridgend, South Wales, United Kingdom

Golden evening light on the cliffs in winter at Dunraven Bay, Southerndown, Bridgend, South Wales, United Kingdom

Coconino National Forest from the southwest summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

View of Cathedral Rock in Sedona from the middle of Oak Creek, Arizona, United States of America, North America

Panoramic view over the Silent City from the Rim Trail at Inspiration Point, dawn, Bryce Canyon National Park, Utah, United States of America, North America