Colin Monteath/ Hedgehog House / Ayers Rock, Uluru Kata Tjuta National Park, Northern Territory, Australia

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

Kevin Schafer / Black-footed Penguin (Spheniscus demersus) group walking near huge stones, Boulders Beach, Cape Peninsula, South Africa

D. Parer & E. Parer-Cook / Volcanic caldera, Daphne Island, Galapagos Islands, Ecuador

Sergey Gorshkov / Tolbachik Volcano erupting, Kamchatka, Russia

Juan Carlos Munoz / Detail of geological rock formations in the sandstone cliffs of Jaizkibel Beach, Gipuzkoa, Basque Country, Spain, May 2012

Juan Carlos Munoz / Man studying the geological rock formations in the sandstone cliffs of Jaizkibel Beach, Gipuzkoa, Basque Country, Spain, May 2012

Linda Pitkin / 2020VISION / Cliffs showing rock striations and geological folding, Pettico Wick, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, August 2011

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

Colin Monteath / Clouds covering Lake Coleridge and Rakaia River from Mount Oakden with Mount Hutt on right, Canterbury, New Zealand

Pete Oxford / Devil's Tower National Monument, Wyoming

Tim Fitzharris / Sandstone striations and erosional features, Badlands National Park, South Dakota