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

Michael Hutchinson / Cruise ship passenger in outdoor hot tub, near mountains, Paradise Bay, Antarctica, January.

Michael Hutchinson / Cruise ship in front of snow covered mountains, Paradise Bay, Antarctica, January.

Doug Perrine / Hot molten pillow lava erupts from an underwater lava tub at ocean entry of eruption from Kilauea Volcano, Hawaii, USA