Nigel Bean / Cheddar Gorge after snowfall. Somerset, UK, February 2009.

Markus Varesvuo / Flock of Crane (Grus grus) flying overhead with a cliff in the foreground. Spain, March.

David Noton / Rough seas at Durdle Door, Dorset, England, November 2009.

David Noton / Durdle Door on the Jurassic Coast of Dorset. England, November 2010.

David Noton / Durdle Door and the Jurassic Coast at dusk, with Weymouth Bay and Portland beyond. Dorset, England, November 2010.

Bryan and Cherry Alexander / Dramatic 'Undulatus asperatus' cloud formation as a storm builds at dawn over Qaanaaq, Inglefield Bay. Northwest Greenland, September 2008. This cloud formation was first proposed as a new type of clo...

Robert Thompson / A cascade of waterfalls falling over a cliff in woodlands. Plitvice National Park, Croatia, May 2010.

Bryan and Cherry Alexander / Huge blocks of ice teeter, ready to become icebergs on the glaciated coast. Gerlache Strait, Southern Ocean, Antarctica, October 2009.

Juergen Freund / Outrigger boat in Big Lagoon, with its karst limestone cliffs, emerald waters and shallow coral reefs in the white sand. North Palawan, Philippines, May 2009.

Juergen Freund / Aerial view of island with steep limestone cliffs, birds' nests amongst the caves are highly protected or guarded for their commercial value in the Chinese market, Palawan, Philippines, May 2009.

Diane McAllister / Female Rocky Mountain bighorn sheep ewe (Ovis canadensis canadensis) warning her newborn lamb that a rocky ledge is too close and dangerous. She places her front hoof on the baby's back, stopping it f...

Brent Stephenson / Steep rock walls of the Tracy Arm, carved out by glacial action over millions of years. Alaska, United States, July 2010.

David Welling / Dried grasses and red rock geological formations along the Smithsonian Butte National Scenic byway. Southern Utah, USA, July.

David Welling / A thunderstorm drops heavy rain over the hoodoo sandstone formations. Bryce Canyon National Park, Utah, USA, August.

Inaki Relanzon / Cliffs and sea-stacks on the coast of "El Hierro" Island. Canary Islands, February 2011.

Inaki Relanzon / Dramatic light on Benijo Beach. Anaga Peninsula, Tenerife, Canary Islands, February 2011.

Inaki Relanzon / Ibon del Acherito, (Acherito Lake), surrounded by mountain peaks. Anso Valley, Pyrenees, Aragon, Spain, July 2007.

Inaki Relanzon / Dolmen d'Eyna at night, with a long exposure capturing star trails. Eyne, Pyrenees, France, September 2010.

Inaki Relanzon / Limestone formations under a heavy sky. Torcal de Antequera Nature Reserve, Malaga, Spain, November 2009.

Matthew Maran / Hikers building up a fire in their cliff-overhang cave. The West Coast Trail, Pacific Rim National Park, Vancouver Island, Canada, September, Model released

Matthew Maran / A man looking out to sea by coastal rock stacks. The West Coast Trail, Pacific Rim National Park, Vancouver Island, Canada, September 2010. Model released.

Juergen Freund / Ancient pictographs (rock / cave paintings) of fish and sea creatures on karst limestone formations. Sunmalelen area, Raja Ampat, West Papua, Indonesia, January 2010

Juergen Freund / Split-level shot of coral reef and island with snorkeller swimming underwater. Misool, Raja Ampat, West Papua, Indonesia, January 2010. Model released.

Juergen Freund / Karst limestone formations rising out of the sea. Sunmalelen area, Raja Ampat, West Papua, Indonesia, January 2010

Juergen Freund / Very old human skulls on a ledge in the karst limestone walls of a Raja Ampat island. Raja Ampat, West Papua, Indonesia, February 2010

Eric Dragesco / A male Markhor (Capra falconeri) traversing a rock face, following hoof marks cut into the cliff. Tajikistan, Central Asia, November.

Eric Dragesco / A male Markhor (Capra falconeri) traversing a steep cliff. Tajikistan, Central Asia, November.

Juergen Freund / Small, tree-covered islet. This is a karst limestone formation with layers eaten away by water. Raja Ampat, West Papua, Indonesia, February 2010

John Waters / Hand reared Whooper Swans (Cygnus cygnus) in flight. Birds imprinted and trained by Lloyd and Rose Buck for filming purposes. Somerset, UK, January 2011

Peter Cairns / 2020VISION / Gannet (Morus bassanus) on nest on cliff. June 2010.

Peter Cairns / 2020VISION / View over Gannet colony (Morus bassanus) with flight trails of birds in flight, Hermaness NNR, Unst, Shetland, Scotland, June 2010

Peter Cairns / 2020VISION / Razorbill (Alca torda) taking off from cliff. June 2010.

Peter Cairns / 2020VISION / Gannet in flight (Morus bassanus) against cliff face, Hermaness NNR, Unst, Shetland, Scotland, June

Juergen Freund / Colorful coral reef with soft corals (Alcyonacea) and fan corals (Gorgonacea). Misool, Raja Ampat, West Papua, Indonesia, January

Mark Taylor / 'The Marble Cathedrals' - marble rocks dissolved and sculpted by water. Rio Tranquilo, Chile, March 2010.

Peter Lewis / A view along Chesil Beach towards the Golden Cap, with Lyme Regis in the distance. Dorset, UK, October.

Edwin Giesbers / A flock of Greylag Goose (Anser anser) flying in formation above misty fields. The Netherlands, March.

Ross Hoddinott / Godrevy Lighthouse at sunset, seen through rocksand rockpool in the foreground. Nr Hayle, Cornwall, UK, June 2009

Inaki Relanzon / Aerial view of Dyrholaey and Reynisdrangar, near Vik, in South Iceland, April 2010

Orsolya Haarberg / Winter landscape with snow-covered trees in forest, Riisitunturi National Park, Lapland, Finland, February 2007

Orsolya Haarberg / Aerial view of Laitaure Delta and Rapa river, Lappland, Sweden, September 2006.

John Cancalosi / Fossil Ray (Heliobatis sp) from the Eocene Epoch, surrounded by bony fish. Green River Formation, Wyoming, USA

John Cancalosi / Fossil Fly (species unknown) from the Early Cretaceous Period. Santana Formation, Brazil

Konstantin Mikhailov / West Caucasian tur (Capra caucasica) Female on rock face, Highlands of West Caucasus Mountains in the Bezengi area, Kabardino-Balkaria Republic, Kabardino-Balkarsky State Nature Reserve, Russia.

Konstantin Mikhailov / West Caucasian tur (Capra caucasica) Female on cliff face, Highlands of West Caucasus Mountains in the Bezengi area, Kabardino-Balkaria Republic, Kabardino-Balkarsky State Nature Reserve, Russia.

Alex Mustard / A split level view of a bull California sealion (Zalophus californianus) swimming beneath Los Islotes sealion colony. La Paz, Mexico. Sea of Cortez, East Pacific Ocean.

Alex Mustard / A silhouette of a California sealion pup (Zalophus californianus) next to cliffs. Los Isotes, La Paz, Mexico. Sea of Cortez, East Pacific Ocean.

Neil Lucas / Panoramic view, Little Razorback Island, Dellbridge Islands, Antarctica, October 2008, Digitally stitched image

Robert Thompson / Aerial view of cliffs at Bunglass bay, Slieve League, west of Kilcar and Killybegs, County Donegal, Republic of Ireland, January 2009

Robert Thompson / Aerial view of Portbraddan and Whitepark Bay, north coast, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of the East Lighthouse, Rathlin Island, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of the East Lighthouse, Rathlin Island, County Antrim, Northern Ireland, UK, September 2009

Eric Baccega / Flowerpot sea stacks with outgoing tide at Hopewell Rocks. The world's highest tides. Bay of Fundy, New Brunswick, Canada, September 2010

Angelo Gandolfi / Punta Forata cave, Montecristo, Tuscany Archipelago National Park, Italy. June 2010

Angelo Gandolfi / Carrion Crows (Corvus corone) mobbing a Bearded vulture (Gypaetus barbatus) Scala di St. Regina gorges. Corte, Parc Naturel Regional de Corse, Corsica island, France, January

Angelo Gandolfi / Bearded vulture (Gypaetus barbatus) in flight over rocky outcrops, Monte Incudine, Parc Naturel Regional de Corse, Corsica island, France, February

Merryn Thomas / Kilt Rock and Loch Mealt waterfall under stormy skies in the morning, bassalt columns visible. Trotternish Peninsula, Isle of Skye, Scotland. September 2010.

Andrew Parkinson / Puffin (Fratercula arctica) in flight, preparing to land on cliff top, with beak full of Sand eels (Ammodytes tobianus) Shetland Islands, Scotland, UK, July (non-ex)

Andrew Parkinson / Fulmar (Fulmarus glacialis) in flight, with view straight down a precipitous cliff face, and resting Northern Gannets (Morus bassanus) Shetland Islands, Scotland, UK, May (non-ex)

Floris van Breugel / Reflected light in Fall Canyon, California's Death Valley National Park, California, USA. January 2010.

Floris van Breugel / Tehachapi mountains at sunrise, with rolling golden hills and oak trees, California, USA. April 2009

Floris van Breugel / A dark passageway of a narrow flooded slot canyon, Zion National Park, Utah, USA. November 2009.

Floris van Breugel / Fisheye view from within Antelope Canyon, near Page, South West Arizona, USA, January 2008

Floris van Breugel / Sensationally twisted sandstone curves of Arizona's famous wave formation seen under partly cloudy skies. Vermilion Cliffs, Arizona, USA, December 2007.

Michel Poinsignon / Eagle owl (Bubo bubo) adult perched on branch close to cliff, Luxembourg, February

Floris van Breugel / View of Pacific coastline in fog and mist, Ruby Beach, Olympic National Park, Washington, USA, June 2008

Christophe Courteau / Desert african elephant (Loxodonta africana) in the Namib Desert, Damaraland, Namibia, August 2009

Jack Dykinga / Eroded formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the night sky...

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...

Jack Dykinga / Valle de la Luna, The Codillera de Sal, formed by layer upon layer of salt, sand and clay, creating strata that buckled with earth's crust and lined with sand dunes. Atacama Desert, Chile. April 2009

Steve Knell / Boreray, under low cloud cover. This holds the largest gannetry in UK (60,000 pairs) St. Kilda, Scotland, July 2009

Eric Baccega / Icebergs and glacier under clear blue sky, Croker Bay, Devon Island, Nunavut, Canada, August 2010

Eric Baccega / Devon Island, under cloud covered sky, Nunavut, Canada. August 2010

Marie Read / Osprey (Pandion haliaetus) taking flight from tufa tower carrying a fish, Mono Lake, California, USA

Juan Manuel Borrero / Ruins of ancient Revash buildings / burial sites, from the period of Chachapoyas culture, Amazonas Department, Peru, October 2009

Guy Edwardes / Reynisdrangur stacks and black sand beach Vik i Myrdal at night, Iceland, June 2009

Guy Edwardes / Svartifoss / Black Falls, Skaftafell National Park Iceland, July 2009

Guy Edwardes / Seljalandsfoss falls, Southern Iceland, June 2009

Alex Hyde / Fingal's Cave, showing basalt columns, Isle of Staffa, Inner Hebrides, Scotland, UK, June 2010

Pete Oxford / Rainforest and Essequibo River, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Rainbow over rainforest and Kanuku Mountains, Upper Takutu-Upper Essequibo, Guyana

Pete Oxford / Rainforest and Kanuku Mountains, Upper Takutu-Upper Essequibo, Guyana

Pete Oxford / Road runnning through rainforest, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Rainforest, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Essequibo River, Iwokrama Rainforest Reserve, Guyana

Donald M. Jones / Canada Goose (Branta canadensis) flying in formation, central Montana

Inaki Relanzon / Lighthouse on Snafellsness Peninsula, Iceland, July 2008

Ross Hoddinott / Ruined tin mineshafts at Botallack Head, near St Just, Cornwall, England, UK. March 2010.

Ross Hoddinott / View of waves crashing against the cliffs at Land's end, Cornwall, England, UK. March 2010.

Jeff Wilson / Rear view of pilots and Trango towers in the Karakoram Mountains, Himalayas, Pakistan, from Pakistani military helicopter, for BBC series Planet Earth. April 2005

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jouan & Rius / Kermit pool in Hancock gorge, Karijini National Park, Pilbara, Western Australia. August 2009

Jouan & Rius / Wave rock, an eroded granite plateau, Hyden area, Western Australia. August 2009

Jouan & Rius / Wave rock, an eroded granite plateau, Hyden area, Western Australia. August 2009