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Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mt. Etna, Sicily, Italy, EuropeThe Piano del Lago cone (above) destroyed the Sapienza cable car.

The Milky Way arches high in the night sky above Roques de Garcia in Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Aurora Borealis over Skittendalen Valley and the Skittendalen River in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

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

Adult bull southern elephant seal (Mirounga leonina) flipping sand onto its back to cool off on South Georgia Island, Southern Ocean

Northern lights (Aurora borealis) illuminate the night sky along the horizon behind mountains near Anchorage, Alaska, United States Of America.

Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico

A person looks at stars near his red tent, Unterer Segnesboden, Flims, District of Imboden, Canton of Grisons (Graubunden), Switzerland, Europe

Panoramic of Devil's Bridge at dawn, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

Ice held up to the sun near the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Aurora Borealis over Tjeldsundet in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis and a shooting star in the woods of Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Sandvannet Lake in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Skittendalstinden in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Mikkelfjellet Mountain in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

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.

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

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

Ice flower sculpted by wind at Stokla pass (4900m), Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Caribbean land hermit crab (Coenobita clypeatus), Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Snow Pass, Alaska, United States of America, North America

Reflection in Alpine lake in Valmalenco, Italian valley in Valtellina, Sondrio province in Lombardy district, Italy, Europe

Lava and ash floes in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Aerial of a little ship floating between the ice below the Eqi glacier, Western Greenland, Denmark, Polar Regions

Guest from the Lindblad Expedition ship National Geographic Explorer photographing soda straw ice in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

The Milky Way arcs above the city lights of Las Palmas De Gran Canaria, Canary Islands, Spain, Europe

Aurora Borealis over Sandvannet Lake in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Vagsfjorden outside of Harstad in Northern Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

A fantastic eruption of Aurora Borealis over Toviktinden Mountain in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Tennevik River in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Sandvannet Lake in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis reflects off the Tennevik River, Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Tennevik River in Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Vagsfjorden in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora borealis over Blafjellet Mountain in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis and a full moon over the Blafjellelva River in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

A magnificent display of aurora borealis shooting up from Toviktinden Mountain in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Skittendalen Valley and the Skittendalen River in Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.

Aurora Borealis over Forramarka Woods in Tennevik, Troms County, Norway. Auroras are the result of the emissions of photons in the Earth's upper atmosphere.