David Noton / Woman and man with livestock walking along path, Isla del Sol, Lake Titicaca, Bolivia, December 2009

Pete Oxford / Sol de Manana fumeroles geothermal activity at 4850 metres Altiplano, SW Bolivia

Jose B. Ruiz / Dune snail (Eobania vermiculata) laying eggs in sand. Arenales del Sol, Alicante, Spain

Angelo Gandolfi / Forest reflected in pool within the Cerrado. Ilha do Padre, Bonito, Mato Grosso do Sol, Brazil.

Jack Dykinga / Sol Duc River Basin, Olympic National Park, Washington, USA, June.

Jack Dykinga / Stream flowing past moss-covered rocks, Sol Duc River Basin, Olympic National Park, Washington, USA. June 2017.

Jack Dykinga / Stream flowing past moss-covered rocks, Sol Duc River Basin, Olympic National Park, Washington, USA. June 2017.

Jack Dykinga / Stream flowing past moss-covered rocks, Sol Duc River Basin, Olympic National Park, Washington, USA. June 2017.

Jack Dykinga / Sol Duc Falls flowing through the narrow gorge of Olympic National Park, Washington, USA. June 2017.

Bernard Castelein / Sol de Manana geyser basin, Reserva Eduardo Avaroa, Altiplano, Bolivia

Merryn Thomas / Boats and pier at Isla del Sol, Lake Titicaca, Bolivia, December 2013.

Merryn Thomas / Cairn with cross on Isla del Sol, Lake Titicaca, Bolivia, December 2013.

Merryn Thomas / Cairn with cross on Isla del Sol, Lake Titicaca, Bolivia, December 2013.

Roland Seitre / Red-capped mangabey (Cercocebus torquatus) group, occurs in coastal forests in central west Africa.

Roy Mangersnes / Low evening light, east coast of Spitsbergen, Svalbard, Norway, March.

Roy Mangersnes / Low evening light on east coast of Spitsbergen, Svalbard, Norway, March.

Kirkendall-Spring / Trees along the trail to Heart Lake in the Sol Duc Rain Forest of Olympic National Park, Washington, USA. August

David Noton / Terraces on Isla del Sol, Lake Titicaca, Bolivia, December 2009

David Noton / Terraces on Isla del Sol, Lake Titicaca, Bolivia, December 2009

David Noton / Woman walking along path, Isla del Sol, Lake Titicaca, Bolivia, December 2009

David Noton / Farmer with his sheep on the Isla del Sol, Lake Titicaca, Bolivia, December 2009

Rob Tilley / Mountain stream in old growth forest at Sol Duc, Olympic NP, Washington, USA, July 2009

Rob Tilley / Sol Duc Falls, Forest at Sol Duc, Olympic NP, Washington, USA, July 2009

Rob Tilley / Mountain stream in old growth forest at Sol Duc, Olympic NP, Washington, USA, July 2009

Kirkendall-Spring / North Fork Sol Duc River, Olympic National Park, Washington, USA

Kirkendall-Spring / Looking down on Sol Duc River in Olympic National Park, Washington, USA

Konrad Wothe / Waterfalls of Sol Duc River, Olympic National Park, Washington

Konrad Wothe / Waterfalls of Sol Duc River, Olympic National Park, Washington

Konrad Wothe / Waterfalls of Sol Duc River, Olympic National Park, Washington

Konrad Wothe / Reflections in Sol Duc River, Olympic National Park, Washington

Jose B. Ruiz / Dune snail laying eggs in sand (Eobania vermiculata) Arenales del Sol, Alicante, Spain

Pete Oxford / Sol de Manana fumeroles at 4850 metres, altiplano region, Bolivia, South America

Doug Allan / Geysers and boiling mud, Sol de Mamama geyser, Altiplano, Bolivia

RHONDA KLEVANSKY / Sol de manana geysers, Altiplano, Bolivia

Pete Oxford / Fumaroles at 4850 meters, altiplano region, Sol de Manana, southwestern Bolivia

Doug Allan / Geysers and boiling mud of Sol de Manana geyser field, Andes, Bolivia

Gavin Hellier / Beach at Nerja, Costa del Sol, Spain

Gavin Hellier / White Village of Casares, Costa del Sol, Andalucia, Spain

Gavin Hellier / White Village of Casares, Costa del Sol, Andalucia, Spain

Gavin Hellier / Beach in Malaga area, Nerja, Costa del Sol, Spain

Gavin Hellier / Colourful fishing boat on beach, Nerja, Costa del Sol, Spain

Gavin Hellier / Nerja coastal landscape, Costa del Sol, Andalucia, Spain

Shane P. White / Geothermal mud pool, Sol de Manana, Bolivia

Roberto Rinaldi / Leaning palm trees on the coastline of Posade del Sol on Guanaja Island, Honduras.

Pete Oxford / Sol de Manana fumeroles at 4850 metres, Altiplano region, Bolivia, South America

Roland Seitre / Mimetic katydid (Tettigoniidae) Colibri del Sol Bird Reserve, Colombia.

Kirkendall-Spring / Rainforest along the Ancient Groves Trail in the Sol Duc Valley of Olympic National Park, Washington state, USA.