Enrique Lopez-Tapia / Tourists on a zodiac going past icebergs in Iceberg Alley, Pleneau Island, Antarctica

Alex Mustard / The narrow Nes Canyon, a fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates in northern Iceland. May 2011.

Merryn Thomas / Broadhaven Beach, Pembrokeshire Coast National Park, Pembrokeshire, Wales, March 2012.

Cheryl-Samantha Owen / West coast rock lobster (Jasus lalandii) commercial fishing boat (James Archer) leaves the Saldhana Bay harbour before the break of dawn. The lights of the town and the lighthouse flash on the horizon...

Franco Banfi / Scuba diver under and between ice formations, Lake Sassolo, Sambuco valley, Ticino, Switzerland. Model released.

Felicity Lanchester,Felicity Lanchester / Cloud iridescence forming above a cumulonimbus cloud, caused by light refraction through individual water droplets and ice crystals at high altitude, Sierra Leone.

Franco Banfi / Scuba diver under ice, Sassolo lake, Sambuco valley, Ticino, Switzerland. Model released.

Benjamin Barthelemy,Benjamin Barthelemy / Landscape view of the Manneporte, a natural rock arch and needle, Etretat, Normandy, France, June

Niall Benvie / Snow squall falling on coastal mountains. Tortenberget across Ballesvika, Senja, Norway, February 2012.

Charlie Summers / Stars draw traces above Naabi Hill acacia trees, Serengeti National Park, Tanzania

Jack Dykinga / Cheyenne River Sioux Tribal Park with severe storm clouds at sunset amid vast grassland, South Dakota, USA

Jack Dykinga / North Rim at Cape Royal with sunset storm light streaming in rays, backlighting the canyon ridges, Grand Canyon National Park, Arizona, USA