Aerial view of man watching sunrise over pumice fields standing on top of rocks, Campo de Piedra Pomez, El Penon, Argentina

Colorful pumice fields at sunrise, Campo de Piedra Pomez, El Penon, Puna, Catamarca, Argentina

Details of white fields pumice fields and volcanic rocks, aerial view, Campo de Piedra Pomez, El Penon, Catamarca, Argentina

Pumice stone field, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Caldera volcano with pumice fields, yellow coloured sulphur stones, Alexandros crater, Nisyros, Dodecanese, Greece, Europe