Wim van den Heever / Ancient dead Camelthorn trees (Vachellia erioloba) with red dunes, and star trails, Namib desert, Sossusvlei, Namibia. Composite.

Paul Williams / View from plane of eroded salt dome, Kavir Desert, Iran, December.

Graham Eaton / An updraft (vortex) of spiralling air and moisture caused by air being displaced by falling water. Pistyll Rhaeadr waterfall, located a few miles from the village of Llanrhaeadr-ym-Mochnant in Powys,...

Alex Mustard / A school of Blackfin barracuda (Sphyraena qenie) forming the number 6 as they circle in deep water adjacent to a coral reef, Yolanda Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea. July. Candid...