Alex Mustard / 2020VISION / Common sunstar (Crossaster papposus), brittlestars and sealoch anemones form a typical undersea community in a Scottish sea loch, Loch Duich, Ross and Cromarty, Scotland, UK, April 2011

Pete Oxford / Devils Tower National Monument, East Wyoming, USA. Rises 1267 feet above surrounding plains, formed by solidification of a molten magma plug.

Andy Trowbridge / Hoar frost / radiation frost on lone Downy birch tree (Betula pubescens) in snow covered field. Southern Norway, February.

Wild Wonders of Europe / Bartocha / Clouds casting shadow over the Leota mountain range, Arges County, Carpathian Mountains, Romania, July

Wild Wonders of Europe / Bartocha / Dark clouds over alpine grassland, Leota mountain range, Arges County, Carpathian Mountains, Romania, July

Oriol Alamany / Two women hiking in Remune valley, Posets-Maladeta Natural Park, Pyrenees, Huesca, Aragon, Spain. Model released.

Peter Lewis / Stones of Pentre Ifan, a megalithic Burial Chamber / Cromleck / Quiot at sunset with sun reflected in Cardiganshire Bay in the background, nr Newport, Pembrokeshire, Wales, UK, June 2010

Jerry Monkman / Woman mountain biking on a trail in an abandoned granite quarry on Millstone Hill, Barre, Vermont, USA. autumn. Model released, October 2010

John Waters / Stream flowing though Wilmersham Wood, near Porlock, Exmoor National Park, Somerset, UK. September 2010. Digital composite

LYNN M. STONE / Guernsey Cows in hill pasture on October morning, Sharon Springs, New York, USA, October 2010

Andy Rouse / Bengal tiger (Panthera tigris tigris) female crossing track searching for prey, Ranthambore NP, Rajasthan, India

Oriol Alamany / Mountain rescue dog (Canis familiaris) female carrying a backpack, near Nuria in Ribes valley, Pyrenees mountains, Catalonia, Spain