Floris van Breugel / Person in White sulphur hotsprings, Chichagof island, South East Alaska, USA, July. model released

Wim van den Heever / Japanese macaque (Macaca fuscata) baby reaching towards steam from hotspring, Jigokudani, Nagano, Japan. February.

Jeff Vanuga / Hiker soaking in thermal area of Shoshone Creek in Shoshone Geyser Basin. Yellowstone National Park, Wyoming, USA, August. Model released.

Jeff Vanuga / Lily flower shaped Fleur de Lis Spring, in the Orion Group of Geysers, Shoshone Geyser Basin, Yellowstone National Park, Wyoming, USA, August 2015.

Jeff Vanuga / Sinter formations in a thermal pool, Shoshone Geyser Basin, Yellowstone National Park, Wyoming, USA, August 2015.

Jeff Vanuga / Boiling Cauldron Geyser and scalloped edges of geyserite, Western Group of Shoshone Geyser Basin, Yellowstone National Park, Wyoming, USA, August.

Jeff Vanuga / White Dome Geyser erupting in the Lower Geyser Basin of Yellowstone National Park, Wyoming, USA, September 2014.

Jeff Vanuga / Grand Geyser eruption in winter. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.

Paul Hobson / Landscape of Old faithful geyser, Yellowstone, Wyoming, USA, February.

Paul Hobson / Map of Mammoth hotsprings, Yellowstone, Wyoming, USA, February.

Paul Hobson / Map of Norris Geyser Basin, Yellowstone, Wyoming, USA, February.

Cyril Ruoso / Silicate geothermal terrace, Bukit Barisan National Park, Sumatra, Indonesia. July.