Shane P. White / Volcanic mudflow, Mount Yasur, Tanna Island, Vanuatu

Shane P. White / Hala (Pandanus tectorius) tree in volcanic field, Mount Yasur, Tanna Island, Vanuatu

Heike Odermatt / Ice in glacial lagoon, with black volcanic dust, Jokulsarlon Lake, Skaftafell National Park, Iceland

Shane P. White / Volcanic mudflow, Mount Yasur, Tanna Island, Vanuatu

Tui De Roy / Cool lava, Sullivan Bay, Santiago Island, Galapagos Islands, Ecuador

Daniel J. Cox / Lava, Fagradalsfjall Volcano, Iceland