Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA

Loic Poidevin / Man walking over colourful mineral deposits at the Dallol hydrothermal site on the Karoum salt lake, Danakil depression, northern Ethiopia, February 2009

Oriol Alamany / Salt deposits on the Dead Sea coast near Wadi Mujib, Jordan, April 2009

Carol Walker / Mustang / Wild horse stallions fighting over mineral deposit, Montana, USA. Pryor

Carol Walker / Mustang / Wild horse licking ground for mineral content, Montana, USA. Pryor

Carol Walker / Mustang / wild horse, stallions fighting at mineral deposit, Montana, USA. Pryor

Carol Walker / Mustang / Wild horse stallion drives stallion from mineral source, Montana, USA.