Guy Edwardes / Aurora borealis above sea stacks, Reykjanes Peninsula, Iceland. 2019.

Gary Bell/ Oceanwide / Cave along coast, Loch Ard Gorge, Port Campbell National Park, Victoria, Australia

Jeff Foott / Tower Arch, Arches National Park, Utah

Jeff Foott / Marching Men formation, Arches National Park, Utah

Jeff Foott / Marching Men formation, Arches National Park, Utah

Jeff Foott / Double Arch seen through Cove Arch, Arches National Park, Utah

Jeff Foott / Full moon over Balanced Rock formation, Arches National Park, Utah

Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Double O Arch, Arches National Park, Utah

Jeff Foott / Turret Arch and the Milky Way, Arches National Park, Utah

Jeff Foott / Mule-ears (Wyethia amplexicaulis) flowers at the The Organ, Arches National Park, Utah

Jeff Foott / Marching Men sandstone formation, Arches National Park, Utah

Jeff Foott / Skyline Arch, Arches National Park, Utah

Jeff Foott / Delicate Arch and the La Sal Mountains, Arches National Park, Utah

David Woodfall / Cheviot sheep grazing eroding machair at front of sand dunes, North Uist, Scotland, UK, June.

Jack Dykinga / Erosion sculpted 'pot-hole' with reflection of clouds at sunset, Muley Point, Cedar Mesa, Bears Ears National Monument, Utah, USA, October 2018.

Tim Fitzharris / Rock arch, Atuh Beach, Nusa Penida, Bali, Indonesia

Jeff Foott / Sandstone rock formations, Theodore Roosevelt National Park, North Dakota

Vincent Grafhorst / Minden / River in sandstone cave, Sof Omar Cave, Ethiopia

Guy Edwardes / Durdle Door at sunrise, Jurassic Coast, Dorset, England, UK. December 2014.

Guy Edwardes / Durdle Door by moonlight, Jurassic Coast, Dorset, England, UK. December 2014.

Guy Edwardes / The Pinnacles, Swanage, Dorset, England, UK. May 2014.

Guy Edwardes / Stair Hole, West Lulworth, Isle of Purbeck, Dorset, England, UK. December 2010.

Guy Edwardes / Pulpit Rock, Isle of Portland, Dorset, England, UK. December 2010.

Guy Edwardes / Sea stacks at sunset, Mangurstadh beach, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2014.

Guy Edwardes / Sea stacks, Mangurstadh beach, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2014.

Guy Edwardes / Sea stacks, Mangurstadh, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2014.

Guy Edwardes / Sea stacks, Mangurstadh, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2014.

Guy Edwardes / Yesnaby Stack, Orkney, Orkney Islands, Scotland, UK. August 2014.

Guy Edwardes / Yesnaby Stack, Orkney, Orkney Islands, Scotland, UK. August 2014.

Guy Edwardes / Yesnaby Stack, Orkney, Orkney Islands, Scotland, UK. August 2014.

Guy Edwardes / The Drongs sea stacks silhouetted at sunset, Hillswick, Northmavine, Shetland, Shetland Isles, Scotland, UK. August 2014.

Guy Edwardes / The Drongs sea stacks silhouetted at sunset, Hillswick, Northmavine, Shetland, Shetland Isles, Scotland, UK. August 2014.

Guy Edwardes / The Drongs sea stacks silhouetted at sunset, Hillswick, Northmavine, Shetland, Shetland Isles, Scotland, UK. August 2014.

Guy Edwardes / Sea Stacks at Mangurstadh, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2015.

Guy Edwardes / Sea Stacks at Mangurstadh, Aird Feinis, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2015.

Guy Edwardes / Durdle Door, Dungy Head and Bats Head at sunset, Isle of Portland on horizon, Jurassic Coast, Dorset, England, UK. December 2014.

Guy Edwardes / Durdle Door and Bats Head at sunset, Jurassic Coast, Dorset, England, UK. December 2014.

Guy Edwardes / Stac a' Phris rock arch, Isle of Lewis, Outer Hebrides, Scotland, UK. March 2017.

Guy Edwardes / Footpath past The Needle, Quiraing, Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, UK. January 2014.

Guy Edwardes / Natural Arch, Siabost, Isle of Lewis, Outer Hebrides, Scotland, UK. March, 2015.

Guy Edwardes / Gaada Stack, Foula, Shetland, Scotland, UK. August, 2016.

Guy Edwardes / Gaada Stack, Foula, Shetland, Scotland, UK. August, 2016.

Guy Edwardes / Gaada Stack, Foula, Shetland, Scotland, UK. August.

Guy Edwardes / Seaweed covered rocks with Gaada Stack in background, Foula, Shetland, Scotland, UK. August, 2016.

Guy Edwardes / Gaada Stack, Foula, Shetland, Scotland, UK. August, 2016.

Guy Edwardes / Gaada Stack, Foula, Shetland, Scotland, UK. August, 2014.

Jack Dykinga / Storm clouds at sunset over balancing eroded boulder, Texas Canyon, Little Dragoon Mountains, Chihuahuan Desert, Arizona, USA. September.

Jack Dykinga / Banded Navajo Sandstone slot canyon in the Escalante Canyon complex. Grand Staircase-Escalante National Monument, Utah, USA.

Jack Dykinga / Cap-rocks on the rim of the Escalante Canyon at dawn. Grand Staircase-Escalante National Monument, Utah, USA, October 2012.

Jack Dykinga / Devils Garden, eroded hoodoo sandstone formations. Grand Staircase-Escalante National Monument, Utah, USA. October.

Jack Dykinga / Eroded sandstone petrified sand dune formations at sunrise, Vermilion Cliffs National Monument, Arizona. USA.

Ingo Arndt / View of Badlands National Park, with shadows cast between mountain peaks, and sediment layers visible, South Dakota, USA. September 2009.

Ingo Arndt / View of Badlands National Park, with shadows cast between mountain peaks, and sediment layers visible, South Dakota, USA. September 2009.

Ingo Arndt / Freestone eroded pillars reflecting sunlight, Naturpark Pfaelzerwald, Rhineland-Palatinate, Germany

Tim Fitzharris / Arch and Milky Way, Alabama Hills, Sierra Nevada, California

Tim Fitzharris / Arch on beach, El Matador State Beach, California

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Tim Fitzharris / Cathedral Rock at sunset, Coconino National Forest, Arizona

Tim Fitzharris / Lightning strike near rock formation, Church Rock, Red Rock State Park, New Mexico

Tim Fitzharris / River in gorge, Rio Grande Gorge, Rio Grande del Norte National Monument, New Mexico

Guy Edwardes / Porth Nanven at sunset, Cot Valley, Cornwall, England, UK. September 2015.

Sergey Gorshkov / Deep canyon, Putorana Plateau, Siberia, Russia

Sergey Gorshkov / Waterfalls in deep canyon in plateau, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Yva Momatiuk & John Eastcott / Sandstone rock formations, Vermillion Cliffs National Monument, Arizona

Ingo Arndt / Sandstone rock formations, Badlands National Park, South Dakota

Ingo Arndt / Sandstone rock formations, Badlands National Park, South Dakota

Ingo Arndt / Sandstone rock formations, Badlands National Park, South Dakota

Ingo Arndt / Sandstone rock formations, Badlands National Park, South Dakota

Tim Fitzharris / El Arco, Cabo San Lucas, Baja California Mexico

Laurent Geslin / Twelve apostles, Great Ocean Road, Victoria, Australia

Graham Eaton / Limestone pavement above Malham Cove, Yorkshire

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

Niall Benvie,Niall Benvie / Dendritic drainage patterns eroded into sand. Isle of Coll, Scotland, October 2012.

Sue Daly,Sue Daly / Northern Arch, Poor Knights Islands Nature Reserve, North Island, New Zealand, January 2013

Denis-Huot / People trekking with Dromedary camels (Camelus dromedarius) through chalk rock formations created by sandstorms, White desert, Sahara, Egypt, February 2009. No release available.

Denis-Huot / Chalk rock formations caused by sand storms, White desert in the Sahara, Egypt, February 2009

Denis-Huot / Chalk rock formations caused by sand storms, White desert in the Sahara, Egypt, February 2009

Kirkendall-Spring / Perspective of mountain biker over handlebars, Taylor Canyon, Island In The Sky District. Canyonlands National Park, Utah, October 2012. Model released.

Erlend Haarberg / Aerial view. Rivulets at the Langjkull glacier. Iceland. September 2010

George Sanker / Ellis River high in White Mountain National Forest. New Hampshire, October 2012.

Gavin Hellier / Volcanic tufa rock formations, Uchisar, Cappadocia, Anatolia, Turkey, 2008

Jack Dykinga / Matkatamiba Canyon with its Muave limestone scoured by erosion. Grand Canyon National Park, Arizona. May 2012.

Jack Dykinga / Shore Acres State Park with sandstone bluffs being pounded by tidal shifting surf, creating waterfalls over concretions in the stone. Oregon

Will Watson / Two men crossing a cloud forest river in spate, Jama Coaque Reserve, Manabi Province, Ecuador, February 2012. No release available.

Philippe Clement / Strange rock formations created by water erosion at the Orgues d'Ille-sur-Tet in the Pyrenees-Orientales, Pyrenees, France, June 2012

Sandra Bartocha / Waves of Baltic Sea washing over and polishing coloured pebbles, Markgrafenheide, Mecklenburg-Vorpommern, Germany, January

Jack Dykinga / Eroded Aztec sandstone, dating back to the Jurassic, 160 million years ago, colourful banding with fins and dikes produced by erosion, Mojave Desert near Las Vegas, Nevada, USA

Jack Dykinga / Colorado River Delta, with watercourse sculpted patterns eroded into the salt / silt flats near the Sea of Cortez, La Reserva del Golfo, Baja, Mexico

Jack Dykinga / Cibecue Creek waterfall pouring through canyon narrows, White Mountain Apache Reservation, Arizona, USA

Eric Baccega / Aerial view of Devon Island, Nunavut, Canada, June 2012.

John Beatty / 2020VISION / Helicopter dropping load onto moorland.

Erlend Haarberg / Londrangar sea stacks, Snaefellsnes peninsula, Iceland, February 2011

Erlend Haarberg / House on cliff top on a windy day, Arnarstapi, Snaefellsnes Peninsula, Iceland, March 2011

Erlend Haarberg / Northern gannet (Morus bassanus) colony on a sea stack and seabird cliff, Langanes peninsula, Iceland, July